The dead might as well try to speak to the living as the old to the young.
Reveal not every secret you have to a friend, for how can you tell but that friend may hereafter become an enemy. And bring not all mischief you are able to upon an enemy, for he may one day become your friend.
Get pleasure out of life...as much as you can. Nobody ever died from pleasure.
You create your opportunities by asking for them.
It is a profitable thing, if one is wise, to seem foolish.
He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave.
Most advances in science come when a person for one reason or another is forced to change fields.