Will tomorrow resemble yesterday?
On the axis: Relation to certainty · a law drawn from experience
The sun has always risen, but what guarantees it will rise tomorrow? No accumulation of observations proves a law: does our trust in the future rest on reason, or on habit alone?
Justification
The problem of brings Hume to the edge of : if no reasoning justifies expecting the future to resemble the past, our most assured beliefs rest on custom, an instinct, not on reason. But the argument does not end in Pyrrhonian paralysis, and that is its point: nature is stronger than doubt, compelling us to believe and act the moment we leave the study. Hume therefore opposes to thoroughgoing , untenable in life, a mitigated (academical) skepticism, a moderate reserve that confines inquiry to what experience can reach.
Enquiry Concerning Human Understanding, sect. IV-V and sect. XII (of the academical or sceptical philosophy) · A Treatise of Human Nature, I, part IV, sect. 1-2
Anchors: Hume · Popper
leads to: Scientific method