Quote by David Hume: “Custom is the great guide of human life.”

This quote means that our daily habits and past experiences largely shape how we think and act. Rather than pure logic, it is the patterns we repeatedly encounter that guide our understanding of the world and our behavior.

In *An Enquiry Concerning Human Understanding*, Hume argued against absolute certainty in knowledge. He posited that our beliefs about cause and effect, and much of our everyday reasoning, are based not on logical necessity but on repeated experience and the formation of habits of thought (custom).

Scottish philosopher and historian whose radical empiricism challenged the foundations of metaphysics and religion. His Treatise of Human Nature and Enquiry Concerning Human Understanding are landmarks of Enlightenment thought, and his scepticism about causation profoundly influenced Kant.