Each traveler should know what he has to see, and what properly belongs to him, on a journey.
Lay hold of life with both hands, whenever thou mayest seize it, it is interesting.
The highest happiness, the purest joys of life, wear out at last.
Be above it! Make the world serve your purpose, but do not serve it.
To accept good advice is but to increase one's own ability.
Mathematics can remove no prejudices and soften no obduracy. It has no influence in sweetening the bitter strife of parties, and in the moral world generally its action is perfectly null.