To know oneself, one should assert oneself.
If you think you can do it, you can.
Do not weep do not wax indignant. Understand.
If you've got a talent, protect it.
Who seeks shall find.
What you do today can improve all your tomorrows.
Wherever you are - be all there.
The dog that trots about finds a bone.
Know or listen to those who know.
By failing to prepare, you are preparing to fail.
Have convictions. Be friendly. Stick to your beliefs as they stick to theirs. Work as hard as they do.
My experience has been that work is almost the best way to pull oneself out of the depths.