An optimist may see a light where there is none, but why must the pessimist always run to blow it out?
You just keep pushing. You just keep pushing. I made every mistake that could be made. But I just kept pushing.
When it is not in our power to follow what is true, we ought to follow what is most probable.
There is nothing so strange and so unbelievable that it has not been said by one philosopher or another.
The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
The reading of all good books is like a conversation with the finest minds of past centuries.
The greatest minds are capable of the greatest vices as well as of the greatest virtues.
The first precept was never to accept a thing as true until I knew it as such without a single doubt.
Perfect numbers like perfect men are very rare.
Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has.
Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it.