To act is easy; to think is hard.
Make the most of time, it flies away so fast; yet method will teach you to win time.
When an idea is wanting, a word can always be found to take its place.
He who is firm and resolute in will molds the world to himself.
There is no permanence in doubt; it incites the mind to closer inquiry and experiment, from which, if rightly managed, certainty proceeds, and in this alone can man find thorough satisfaction.
Ignorant men raise questions that wise men answered a thousand years ago.