“As knowledge increases, the verdict of yesterday must be reversed today, and in the long run the most positive authority is the least to be trusted.”

“C'est l'inconnu qui excite l'ardeur des savants, qui, dans le seul connu, se flétriraient.”

“He who asks a question is a fool for five minutes. He who does not ask a question is a fool forever. O-# It is the constant and determined effort that breaks down resistance and sweeps away all obstacles.”

“As a rule, he or she that has the most information will have the greatest success in life.”

“Only if you reach the boundary will the boundary recede before you. And if you don't, if you confine your efforts, the boundary will shrink to accommodate itself to your efforts. And you can only expand your capacities by working to the very limit.”