It's always too early to quit.
You never know what motivates you.
The secret of getting ahead is getting started.
Expect problems and eat them for breakfast.
Go for it now. The future is promised to no one.
What you do today can improve all your tomorrows.
If you think you can do it, you can.
After a storm comes a calm.
The dog that trots about finds a bone.
Problems are not stop signs, they are guidelines.
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.