Know or listen to those who know.
Begin to be now what you will be hereafter.
Be kind whenever possible. It is always possible.
It's always too early to quit.
If you're going through hell, keep going.
By failing to prepare, you are preparing to fail.
Always desire to learn something useful.
Wherever you are - be all there.
If you've got a talent, protect it.
Without hard work, nothing grows but weeds.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.