Great is the power of habit. It teaches us to bear fatigue and to despise wounds and pain.
Marcus Tullius CiceroNature has lent us life at interest, like money, and has fixed no day for its payment.
Marcus Tullius CiceroOur character is not so much the product of race and heredity as of those circumstances by which nature forms our habits, by which we are nurtured and live.
Marcus Tullius Cicero