Above all, challenge yourself. You may well surprise yourself at what strengths you have, what you can accomplish.
If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them.
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 labor is immense.
Do not confuse motion and progress. A rocking horse keeps moving but does not make any progress.
Someone's sitting in the shade today because someone planted a tree a long time ago.
To think is easy. To act is hard. But the hardest thing in the world is to act in accordance with your thinking.
Enjoy the little things, for one day you may look back and realize they were the big things.
If you're not failing every now and again, it's a sign you're not doing anything very innovative.
If you're made of the right material, a hard fall is bound to result in a high bounce.
It is your attitude and not your aptitude that determines your altitude.