Be thine own palace, or the world's thy jail.
If you can dream it, you can do it.
If you've got a talent, protect it.
The dog that trots about finds a bone.
Wherever you are - be all there.
It's always too early to quit.
Always desire to learn something useful.
Only the educated are free.
If you think you can do it, you can.
Be gentle to all and stern with yourself.
All the mathematical sciences are founded on relations between physical laws and laws of numbers, so that the aim of exact science is to reduce the problems of nature to the determination of quantities by operations with numbers.