You never know what motivates you.
Be kind whenever possible. It is always possible.
What you do today can improve all your tomorrows.
The dog that trots about finds a bone.
Begin to be now what you will be hereafter.
Be gentle to all and stern with yourself.
If you've got a talent, protect it.
Quality is not an act, it is a habit.
Always desire to learn something useful.
Either you run the day or the day runs you.
The object of pure physics is the unfolding of the laws of the intelligible world the object of pure mathematics that of unfolding the laws of human intelligence.