I can, therefore I am.

If you think you can do it, you can.

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

Problems are not stop signs, they are guidelines.

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

It's always too early to quit.

Things do not happen. Things are made to happen.

Well done is better than well said.

To know oneself, one should assert oneself.