I can, therefore I am.

To know oneself, one should assert oneself.

Never complain and never explain.

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

You never know what motivates you.

If you're going through hell, keep going.

Things do not happen. Things are made to happen.

Expect problems and eat them for breakfast.

Do not weep do not wax indignant. Understand.