What is impossible by the nature of things is not confirmed by any law.

There is a certain virtue in every good man, which night and day stirs up the mind with the stimulus of glory, and reminds it that all mention of our name will not cease at the same time with our lives, but that our fame will endure to all posterity.

Philosophy is true mother of the arts [of science].

It is our duty, my young friends, to resist old age.

More is lost by indecision than wrong decision. Indecision is the thief of opportunity. It will steal you blind.

The nobler a man, the harder it is for him to suspect inferiority in others.

Through ignorance of what is good and what is bad, the life of men is greatly perplexed.