You never know what motivates you.
Without hard work, nothing grows but weeds.
To know oneself, one should assert oneself.
Problems are not stop signs, they are guidelines.
Quality is not an act, it is a habit.
Expect problems and eat them for breakfast.
If you've got a talent, protect it.
Go for it now. The future is promised to no one.
Begin to be now what you will be hereafter.
I can, therefore I am.
Crabbed and obscure definitions are of no use beyond a narrow circle of students, of whom probably every one has a pet one of his own.