David Hume (1766 Allan Ramsay portrait) Key Ring

Carry a piece of Enlightenment philosophy wherever you go with this keychain featuring Allan Ramsay’s famous 1766 portrait of David Hume. Printed in vibrant detail with a durable finish, this practical daily accessory showcases the iconic Scottish philosopher and historian in classic fine-art style. Perfect for philosophy majors, professors, history buffs, and fans of classical portraiture, it makes a thoughtful and unique gift for intellectuals and academics. Hume argued that inductive reasoning and belief in causality cannot be justified rationally; instead, they result from custom and mental habit. We never actually perceive that one event causes another but only experience the "constant conjunction" of events. This problem of induction means that to draw any causal inferences from past experience, it is necessary to presuppose that the future will resemble the past, a presupposition which cannot itself be grounded in prior experience.