If you can dream it, you can do it.
If you're going through hell, keep going.
It's always too early to quit.
The dog that trots about finds a bone.
You never know what motivates you.
If you think you can do it, you can.
The wise does at once what the fool does at last.
Who seeks shall find.
Wherever you are - be all there.
I can, therefore I am.
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.