100% Sourced Quotations
When written in Chinese, the word crisis is composed of two characters. One represents danger and the other represents opportunity.
John F. Kennedy
The only fence against the world is a thorough knowledge of it, into which a young gentleman should be enter'd by degrees, as he can bear it; and the earlier the better, so he be in safe and skillful hands to guide him.
A man may imagine things that are false, but he can only understand things that are true, for if the things be false, the apprehension of them is not understanding.
I have had my results for a long time: but I do not yet know how I am to arrive at them.
Carl Friedrich Gauss
We know the truth not only through our reason but also through our heart. It is through the latter that we know first principles, and reason, which has nothing to do with it, tries in vain to refute them.
We cannot prevent equilibrium from producing its effects. We may brave human laws, but we cannot resist natural ones.
Predictions that didn't happen
If it's on the Internet it must be true
Remarkable Last Words (or Near-Last Words)