4:23 Forbidden to you are your mothers and daughters, your sisters….
The allusion in this verse is that the Shariah is built on making oneself a servant, not on self-exertion; the canon of the religion is transmitted, not rationally derived; and the basis of the Sunnah is surrender, not looking for reasons.
Surrender is an easy road, its domicile flourishing, its goal the approval of the All-Merciful. Self-exertion and self-determination are a difficult roads, their domicile in ruins, their goal unwholesome. Watch out! Jump away from the road of self-exertion and cling to surrender. Avoid self-determination and looking for reasons. Whatever the Shariah has declared forbidden, consider it forbidden—a consignment by the Desire, built upon the Will. If it had been permitted in place of forbidden, the same would be the case, for it would have been current in the holy Shariah and would have no cause or ambiguity. For He is the Real—majestic is His majesty! He does whatsoever He wills [3:40] and decrees whatsoever He desires [5:1]. He forbids what He wills to those whom He wills and He allows what He wills to those whom He wills. His artisanry has no cause and His decree no protester.
