Learn what is true in order to do what is right.
Try to learn something about everything and everything about something.
A good man: body serves his will and enjoys hard work, clear intellect that understands the truths of nature, full of passion for life but controlled by his will, well-developed conscience, loves beauty in art and nature, despises inferior morality, respects himself and others.
Veracity is the heart of morality.
Only a scientific people can survive in a scientific future.
There is no sadder sight in the world than to see a beautiful theory killed by a brutal fact.