It's always too early to quit.
After a storm comes a calm.
Never complain and never explain.
Only the educated are free.
What you do today can improve all your tomorrows.
Do not weep do not wax indignant. Understand.
Know or listen to those who know.
The wise does at once what the fool does at last.
The dog that trots about finds a bone.
Without hard work, nothing grows but weeds.
The human imagination has already come to conceive the possibility of recreating human society.
The product of the scientific imagination is a new vision of relations - like that of artistic imagination.