" how vain, I say, it is to expect demonstration and certainty in things not capable of it; and refuse assent to very rational propositions, and act contrary to very plain and clear truths, because they cannot be made out so evident as to surmount every the least (I will not say reason, but) pretence of doubting. "

― , The Empiricists: Locke: Concerning Human Understanding; Berkeley: Principles of Human Knowledge & 3 Dialogues; Hume: Concerning Human Understanding & Concerning Natural Religion