It's always too early to quit.
Be thine own palace, or the world's thy jail.
Things do not happen. Things are made to happen.
Leap, and the net will appear.
The dog that trots about finds a bone.
Know or listen to those who know.
Never complain and never explain.
Wherever you are - be all there.
Only the educated are free.
You never know what motivates you.
If God has made the world a perfect mechanism, He has at least conceded so much to our imperfect intellect that in order to predict little parts of it, we need not solve innumerable differential equations, but can use dice with fair success.