If you think you can do it, you can.
The dog that trots about finds a bone.
Never complain and never explain.
Begin to be now what you will be hereafter.
I can, therefore I am.
After a storm comes a calm.
Things do not happen. Things are made to happen.
Who seeks shall find.
Wherever you are - be all there.
If you've got a talent, protect it.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.