Problems are not stop signs, they are guidelines.
It's always too early to quit.
Without hard work, nothing grows but weeds.
By failing to prepare, you are preparing to fail.
Well done is better than well said.
If you've got a talent, protect it.
Do not weep do not wax indignant. Understand.
The secret of getting ahead is getting started.
I can, therefore I am.
You never know what motivates you.
All science is either physics or stamp collecting.