Virtuous people often revenge themselves for the constraints to which they submit by the boredom which they inspire.
— Confucius

The shallow consider liberty a release from all law, from every constraint. The wise man sees in it, on the contrary, the potent Law of Laws.
Walt Whitman constraint quote

Freedom is not being a slave to any circumstance, to any constraint, to any chance; it means compelling Fortune to enter the lists on equal terms.
— Marcus Annaeus Seneca Seneca The Elder

The more constraints one imposes, the more one frees one
— Igor Stravinsky

The more constraints one imposes, the more one frees one's self. And the arbitrariness of the constraint serves only to obtain precision of execution.
— constraint quotation by Igor Stravinsky