This is because it is among the Immoralities (Fawahish) whose Outward and Inward Allah has forbidden, according to the saying of the Almighty: {And leave the outward of sin and its inward} (Al-An'am: 120).

I shall provide for you, O seeker, in what follows, the categories of:

The forbidden and permissible Outwardly, but not Inwardly.

The permissible and forbidden Inwardly, but not Outwardly.

The permissible and forbidden both Outwardly and Inwardly.

This is so you may know the nature of such matters, as will come in its proper place, God willing.

As for the saying of the Sharif: "The wise man is he who places things in their proper places," this phrase is used in various senses, as previously mentioned. Namely, the wise man intends what Allah the Almighty desires of the Inwards (Bawatin) of these Outward things with which He addressed us in the revealed Books. For it is not permissible for the wise man to believe [solely] in these transient, worldly, outward sensory forms; rather, it is a duty upon him to know their Inwards, so that he may be [The wise man] has placed things in their proper places, taken from things their beauties and essences, and looked toward the place of the pleasure of Allah and His Messenger in all his affairs.