A pledge. A contract. A promise - given and returned. All of these are in the nature of commitments. Marriage is the largest commitment anyone can make - and the longest. A man can violate a pledge, break a contract, evade a responsibility - do any or all of these things and still keep his innermost self intact. He can change his residence, change his work, change his companions, with small damage to his psyche - but it will be severest break of his existence, if for whatever reason, he changes his wife...