Philosophy is true mother of the arts [of science].
You may never be less alone than when you are alone.
Wisdom is not only to be acquired, but enjoyed.
I cheerfully quit from life as if it were an inn, not a home; for Nature has given us a hostelry in which to sojourn, not to abide.
Every one is least known to himself, and it is very difficult for a man to know himself.
The authors who affect contempt for a name in the world put their names to the books which they invite the world to read.