It is a common idea amongst all religious and spiritual traditions that human beings should have some kind of self-control. Although we enjoy free will, we need to exercise our free will in a responsible way. In the same way that we expect others to respect our dignity and interests, we should respect dignity and interests of others. We should also safeguard our own dignity and long term interests. Thus, we cannot simply go after our whims and desires and do whatever we want. We need to have self-control and self-discipline which leads to self-purification. If we purify our hearts we will no longer need to resist our temptations and control ourselves against lower desires and lusts, since a purified person desires nothing except what is good and moral for himself and others. In what follows, we will study the necessity of self-control and self-purification.