[Pooya/Ali Commentary 23:5] Every believer must guard himself against every kind of sex abuse or sex perversion. Refinement or degradation of human soul is the result of how one deals with the hidden workings of the sex instincts. Even the natural exercise of sex is restricted to the marriage bond. This brief verse comprehends every aspect of chastity. A true believer must hold in check his or her sex urge within the prescribed bounds. Because of inherent and latent danger in fulfillment of sexual prompting, even its minimum activity is strictly restricted to the bonds of wedlock, under which the rights of both parties, man and woman, are duly regulated and maintained. In view of the seriousness of the issue the word hafizun is used, which implies that the natural demands of sexual desires should be treated as a trust to be managed judiciously without ever misusing it.