Tendency and completion of enjoyment, both are the meanings of chastity. First it is essential to get detached from sensual enjoyments then enjoy the wealth of soul. All of this tendency is possible when one gets delighted in his own brahma soul. And this is possible when one doesn’t take delight in his wife or other girls through emotions, speech and body and when he gives up this enjoyment. A person who gets delighted in worldly things, transmigrates. So giving up the worldly things is a must to make alliance with yourself.