Having once decided to achieve a certain task, achieve it at all costs of tedium and distaste. The gain in self-confidence of having accomplished a tiresome labour is immense.
Enoch Arnold Bennett
If you have no confidence in self, you are twice defeated in the race of life. With confidence, you have won even before you have started.
Marcus Garvey
Education is the ability to listen to almost anything without losing your temper or your self-confidence.
Robert Frost