What is meant by the beloved's division of himself for himself and for others in the context of God's love for Himself, and is it intended to mean God's love for His Self or love of God's essence or both, and what is the difference between this and your statement that whoever loves his wife for her essence is not a polytheist?

Allah's love for His essence means His love for Himself. He alone is loved for His essence, and everything else is loved for His sake, and their love is subservient to His love, glory be to Him. Loving a disbelieving wife is not forbidden if it is not for her religion, such as a kinship or marital relationship. As mentioned in the Quran, the Prophet, peace and blessings be upon him, loved his uncle due to their close relation, and the presence of affection and mercy between spouses includes a Kitabiyyah (woman from the People of the Book). Furthermore, loving one's wife does not contradict the love of Allah and His Messenger, as long as it does not exceed its natural limits.