It's always too early to quit.

You never know what motivates you.

To know oneself, one should assert oneself.

If you've got a talent, protect it.

To be a good loser is to learn how to win.

Know or listen to those who know.

By failing to prepare, you are preparing to fail.

Be gentle to all and stern with yourself.

Be thine own palace, or the world's thy jail.