Never complain and never explain.
Quality is not an act, it is a habit.
Things do not happen. Things are made to happen.
Without hard work, nothing grows but weeds.
The dog that trots about finds a bone.
The secret of getting ahead is getting started.
I can, therefore I am.
Who seeks shall find.
Know or listen to those who know.
You never know what motivates you.
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.