To know oneself, one should assert oneself.
After a storm comes a calm.
The most effective way to do it, is to do it.
You never know what motivates you.
Without hard work, nothing grows but weeds.
What you do today can improve all your tomorrows.
Be gentle to all and stern with yourself.
The dog that trots about finds a bone.
By failing to prepare, you are preparing to fail.
Wherever you are - be all there.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.