What are the strengths and weaknesses of rationalism and empiricism, and how do they answer the problem of knowledge?
Evaluating rationalism and empiricism: the strengths and weaknesses of Descartes' rationalism and Hume's empiricism, the main objections to each, and a comparative assessment of how well each answers the sceptical problem of knowledge.
How to evaluate Descartes' rationalism and Hume's empiricism in SQA Higher Philosophy: the strengths and weaknesses of each, the key objections (the Cartesian circle, the limits of the copy principle), and a comparative judgement on the problem of knowledge.
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What this dot point is asking
Having set out Descartes' rationalism and Hume's empiricism, you must evaluate them: weigh the strengths and weaknesses of each, deploy the main objections (the Cartesian circle against Descartes; the limits of the copy principle against Hume), and reach a comparative judgement on which better answers the problem of knowledge. This is where the higher marks live, because the question papers reward evaluation and a supported conclusion, not mere description.
Evaluating Descartes' rationalism
Strengths. The cogito is a real achievement: it is genuinely indubitable, since doubting it confirms it, so Descartes secures at least one certainty against even the evil demon. The demand for clear and distinct ideas is a serious standard, and rationalism explains how we can have a priori knowledge, such as mathematics and logical truths, that experience alone seems unable to deliver.
Weaknesses. The trouble comes after the cogito. To rebuild knowledge of the external world, Descartes argues that a non-deceiving God guarantees our clear and distinct ideas. This invites the Cartesian circle objection:
Rationalism is also pressed on how reason alone, without experience, can deliver substantive knowledge of how the world actually is, rather than just relations between ideas.
Evaluating Hume's empiricism
Strengths. Empiricism ties knowledge firmly to evidence, which fits the success of empirical science, and the copy principle is a powerful tool for exposing empty or confused concepts by demanding their source impression. It is admirably economical: it posits no innate ideas or rational insights beyond what experience supplies.
Weaknesses. Empiricism struggles with knowledge that appears a priori. Mathematical and necessary truths ("7 + 5 = 12", "every event has a cause") seem certain and known independently of any particular experience, yet a strict empiricism must derive everything from impressions. More sharply, Hume's own principles drive him to scepticism that seems to prove too much: if we cannot justify causation or the continuing self, ordinary knowledge and science look undermined, which many take as a reductio against the strict empiricist starting point.
A comparative judgement
The two positions are strongest where the other is weakest. Rationalism explains necessary, a priori knowledge but struggles to reach the world; empiricism grounds knowledge of the world in evidence but struggles with necessary truths and slides towards scepticism. This suggests that both reason and experience may be needed, the line Kant later took, arguing that knowledge requires sensory input organised by the mind's concepts. A defensible exam judgement is that empiricism better fits empirical and scientific knowledge, while rationalism better explains mathematics and necessary truths, so neither is wholly adequate alone. The marks reward whichever judgement you defend with balanced reasons.
Examples in context
Take the claim "every event has a cause." A rationalist treats it as a necessary truth knowable by reason, which explains its certainty but not how reason alone could discover a fact about all events. An empiricist must derive it from experience, yet Hume shows we have no impression of necessary connection, so on strict empiricism the principle is merely a habit of expectation, not knowledge, an uncomfortable result for science, which assumes causes. The same claim thus exposes each theory's weak point: rationalism over-reaches what reason can ground, empiricism under-delivers what science needs. A strong evaluation uses exactly this kind of test case to show where each position strains, then judges accordingly.
Try this
Q1. State one strength and one weakness of Hume's empiricism. [2 marks]
- Cue. Strength: it ties knowledge to evidence and exposes empty concepts via the copy principle. Weakness: it struggles with a priori knowledge (mathematics) and leads to scepticism about causation and the self.
Q2. What is the Cartesian circle objection to Descartes? [2 marks]
- Cue. Descartes uses clear and distinct ideas to prove a non-deceiving God, yet relies on that God to guarantee that clear and distinct ideas are true, so the reasoning is circular.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA Higher (P2)8 marksTo what extent does Descartes' rationalism succeed in answering scepticism? Evaluate.Show worked answer →
The marks reward a balanced evaluation that weighs strengths against objections and reaches a supported judgement, not just description. Set out the strength first: the cogito is genuinely indubitable, giving an certain starting point that the sceptic cannot shake, and the search for clear and distinct ideas is a serious method.
Then press the objections: the move beyond the cogito relies on proving a non-deceiving God, and the argument is accused of circularity (the Cartesian circle), since Descartes uses clear and distinct ideas to prove God yet relies on God to guarantee clear and distinct ideas. Also, rationalism struggles to explain how reason alone delivers substantive knowledge of the world. Conclude with a judgement: the cogito succeeds against radical doubt, but the wider rebuilding of knowledge is contested, so rationalism answers scepticism only in part.
SQA Higher (P2)8 marksCompare the strengths and weaknesses of rationalism and empiricism as theories of knowledge.Show worked answer →
Marks reward a genuine comparison across both positions with strengths, weaknesses and a judgement. Rationalism's strength is its account of certain, a priori knowledge (mathematics, the cogito); its weakness is explaining how reason alone reaches the world and the charge of circularity in Descartes.
Empiricism's strength is that it ties knowledge to evidence and exposes empty concepts via the copy principle; its weaknesses are that it struggles with knowledge that seems a priori (mathematics, necessary truths), and that Hume's own principles drive him to scepticism about causation and the self, which seems to prove too much. A strong answer notes that each is strong where the other is weak, that experience and reason may both be needed, and reaches a judgement, for example that empiricism better fits scientific knowledge while rationalism better explains necessary truths.
Related dot points
- The problem of knowledge: the distinction between knowledge and belief, the justified true belief account of knowledge, the sources of knowledge (reason and sense experience), and the sceptical challenge that we cannot be certain of what we claim to know.
How SQA Higher Philosophy sets up the problem of knowledge: knowledge versus belief, the justified true belief definition, reason and sense experience as sources of knowledge, and the sceptical challenge that undermines our certainty.
- Rationalism and Descartes: the method of doubt, the three waves of doubt (the senses, the dream argument, the evil demon), the cogito as the first certainty, and the rationalist claim that reason is the foundation of knowledge.
How Descartes uses the method of doubt in the Meditations to seek certainty: the three waves of doubt, the cogito (I think, therefore I am) as the indubitable foundation, and the rationalist claim that reason is the primary source of knowledge.
- Empiricism and Hume: the claim that all knowledge derives from sense experience, the distinction between impressions and ideas, the copy principle, the fork between relations of ideas and matters of fact, and Hume's sceptical conclusions about causation and the self.
How Hume's empiricism grounds knowledge in sense experience: impressions and ideas, the copy principle, Hume's fork (relations of ideas versus matters of fact), and his sceptical conclusions about causation and the self.
- Evaluating arguments: judging the premises for acceptability, judging the premises for relevance to the conclusion, judging whether the premises are sufficient to support the conclusion, and applying the principle of charity when interpreting an argument.
How to evaluate an argument in SQA Higher Philosophy using the criteria of acceptability, relevance and sufficiency, how these criteria connect to validity and soundness, and why the principle of charity matters when interpreting an argument.
- Inductive arguments and reliability: how induction differs from deduction, the main inductive patterns (generalisation from a sample, argument from analogy, causal and predictive inference, appeal to authority), and the criteria that make an inductive argument reliable or weak.
How SQA Higher Philosophy treats inductive reasoning: the difference between induction and deduction, the main inductive forms (generalisation, analogy, causal and predictive inference, appeal to authority), and what makes an inductive argument reliable rather than weak.
- The course assessment: the structure of the externally marked question papers covering Arguments in Action, Knowledge and Doubt and Moral Philosophy, the command words used, and how marks are awarded across short-answer, analysis and extended-response questions.
An overview of how SQA Higher Philosophy is assessed: the externally marked question papers across the three areas of study, the command words (explain, analyse, evaluate), and how marks are awarded across short-answer, analysis and extended-response questions.
Sources & how we know this
- Higher Philosophy Course Specification — SQA (2022)