Under the rules of a society that cannot distinguish between profit and profiteering, between money defined as necessity and money defined as luxury, murder is occasionally obligatory and always permissible.
— Lewis H. Lapham

Islam exhorts men to respect and honor women. The status of the wife is so respected in Islam that it is not obligatory for her to do household chores. She may do them of her own accord. But if her husband forces her to do household work, he will have to account for his conduct in the hereafter.
Anonymous obligatory quote

Every judgement of conscience, be it right or wrong, be it about things evil in themselves or morally indifferent, is obligatory, in such wise that he who acts against his conscience always sins.
— Thomas Aquinas

Jihad is obligatory for the Muslims.
— Abu Bakr

We are all happy when U.S. soldiers are killed week in and week out. The killing of U.S. soldiers in Iraq is legitimate and obligatory.
— obligatory quotation by Walid Jumblatt