He that sweareth to his own hurt, and changeth not— The greatest temptation to the breach of oaths and promises to others, is, when the performance of them brings mischief on ourselves; for then is the trial of a man's virtue; and not when he designs either to gain, or not to lose any thing by it. It is, therefore, a very considerable part of a just man's character, that, whatever temporal inconvenience it may involve him in, he breaks not his oath which he has once given.
Related Commentaries of Psalms 15:4
Psalms 15:4
4 In whose eyes a vile person is contemned; but he honoureth them that fear the LORD. He that sweareth to his own hurt, and changeth not.