David Hume
Scepticism · Reason · Certainty
David Hume was born in Edinburgh in 1711 and became one of the central figures of the Scottish Enlightenment. Philosopher, historian and essayist, he sought to understand human knowledge by examining how the mind actually forms beliefs from experience.
His scepticism challenged some of philosophy’s deepest assumptions about causation, reason and certainty, and profoundly influenced later thinkers, most famously Kant.
The Idea
We are often more certain than the evidence allows.
Hume argued that we do not directly perceive causes. We observe events occurring together and, through repeated experience, come to expect that one will follow another.
The mind then supplies the connection.
Much of what feels like certainty therefore rests upon habit, expectation and inference rather than direct proof.
Hume’s response was not to abandon knowledge, but to become more careful about what we claim to know.
Hume and Owain Morgan
Hume gives Owain one of the most important disciplines in his method:
Do not confuse a convincing explanation with a demonstrated one.
Human beings are remarkably good at constructing coherent accounts.
An event occurs. Another follows it. A motive seems apparent. The pieces fit together, and almost without noticing the transition, possibility becomes probability and probability becomes certainty.
Owain distrusts that transition.
When someone says that one event caused another, he asks what has actually been observed. Is the connection established, or does it merely seem natural because it accords with expectation?
This becomes particularly important when dealing with witnesses.
People do not necessarily distinguish between what they saw and what they concluded from what they saw. A witness may observe a movement and infer an intention; hear part of a conversation and supply its meaning; remember two events and assume a causal relationship between them.
The resulting account may be entirely sincere.
It may also contain things that were never actually witnessed.
Hume therefore encourages Owain to separate observation from inference.
What was seen?
What was heard?
What has subsequently been concluded?
Only after making those distinctions does Owain begin to construct an explanation of his own. And even then, Hume remains useful.
Owain’s explanation is also an inference.
However persuasive the pattern becomes, he must subject his own reasoning to the same scrutiny he applies to everyone else’s.
Hume therefore leaves Owain with a question that applies as much to himself as to a witness:
What do I know — and what have I merely concluded?
The Unresolved Question
Scepticism can become paralysing.
If every inference is questioned and absolute certainty is unavailable, how can anyone ever reach a conclusion?
Owain cannot wait for perfect knowledge. Human conduct rarely provides it.
He must judge between explanations of differing probability, accepting that some conclusions will always remain provisional.
Uncertainty does not make judgement impossible. It makes the degree of certainty important.
Hume therefore teaches Owain restraint rather than indecision: to follow the evidence as far as it allows, and no farther.
Further Reading
A Treatise of Human Nature (1739–40) — Hume’s ambitious early examination of perception, belief, causation, emotion and human nature.
An Enquiry Concerning Human Understanding (1748) — a more concise presentation of his arguments concerning experience, causation and the limits of human knowledge.
An Enquiry Concerning the Principles of Morals (1751) — Hume’s examination of moral judgement, sympathy and the relationship between reason and feeling.
The Essence
‘Be a philosopher; but, amidst all your philosophy, be still a man.’
For Owain, Hume provides an essential intellectual caution: the mind naturally completes patterns that the evidence itself may leave unfinished.
The task is not to eliminate inference — that would make understanding impossible — but to remember where observation ends and interpretation begins.