It's always too early to quit.

To know oneself, one should assert oneself.

Know or listen to those who know.

If you've got a talent, protect it.

Do not weep do not wax indignant. Understand.

The wise does at once what the fool does at last.

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

Be gentle to all and stern with yourself.

What you do today can improve all your tomorrows.