When we know our own strength, we shall the better know what to undertake with hopes of success; and when we have well surveyed the powers of our own minds, and made some estimate what we may expect from them, we shall not be inclined either to sit still, and not set our thoughts on work at all, in despair of knowing any thing; nor, on the other side, question every thing, and declaim all knowledge, because some things are not to be understood.
Source:Book I. Of Innate Notions, Chapter I. Introduction
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