Page:A Letter to Adam Smith on the Life, Death, and Philosophy of his friend David Hume (1777).djvu/55

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POSTSCRIPT.
41

That the universe is nothing but a heap of perceptions, without a substance.

That though a man could bring himself to believe, yea, and have reason to believe, that every thing in the universe proceeds from some cause; yet it would be unreasonable for him to believe, that the universe itself proceeds from a cause.

Of Human Knowlege.

That the perfection of human knowlege is to doubt.

That we ought to doubt of every thing, yea, of our doubts themselves, and therefore, the utmost that philosophy can do,