Know or listen to those who know.
If you think you can do it, you can.
The wise does at once what the fool does at last.
Be gentle to all and stern with yourself.
If you've got a talent, protect it.
It's always too early to quit.
I can, therefore I am.
Only the educated are free.
The dog that trots about finds a bone.
Expect problems and eat them for breakfast.
Imagination is as vital to any advance in science as learning and precision are essential for starting points.