One will readily note that all of the goals of Islam are highly interconnected. This is quite logical. Actually, they all flow from the foundation of true monotheism. When a person embodies the teachings of Islamic monotheism, he then frees himself from worshiping anybody else or anything else.
Furthermore, he will then lead his life in this world in a way that is best for society and civilization. He will work for justice and ensure that neither he nor others wrong others. In the end, he will find true peace and will be able to pass that along to others. But all of this must start with the true internalization of pure monotheism, where one worships and submits to Allah, sincerely and devoutly practicing the religion of Allah in this life.
Thus, clearly, once a person understands, accepts and applies the true concept of Islamic monotheism concept in his life, the other aspects are achieved as corollaries to this main goal. One the other hand, without true monotheism, the other goals cannot be achieved, even at a superficial level. Hence, it is understandable that, in essence, all of the Quran is concerning tauheed or pure monotheism. The commentator on one of the famous expositions of Islamic belief, al-Aqeedah al-Tahaawiyya, also noted that all of the Quran is actually a discussion of pure monotheism (tauheed):
Most of the chapters in the Quran are concerned with the two types of tauheed54; in fact, every chapter in the Quran [is concerned with tauheed]. The Quran either reports about Allah’s names and attributes. This is the tauheed that one must have knowledge about and that is reported. Or the Quran calls to His worship, associating no partner with Him [in that worship] and abandoning any other idol other than Him. This is the tauheed of intention and will. Or the Quran orders, prohibits or commands [His] obedience.
These are essential aspects of tauheed and part of its completeness. Or the Quran reports about how [Allah] honors the people [who adhere to] tauheed and what He does for them in this world and what He graciously bestows on them in the Hereafter. That is the reward for [adhering to] tauheed. Or [the Quran] reports about the polytheists and how He treats them in this world and what kind of punishment they will receive in the end. That is the punishment for those who abandon the aspects of tauheed.55
54 What is meant by the “two types of tauheed” is tauheed with respect to (1) what one believes in and acknowledges as true and (2) one’s devotions and worship in his life.
55 Sadr al-Deen Abu al-Izz al-Hanafi, Sharh al-Tahaawiyya fi al-Aqeeda al-Salafiyyah (Fairfax, VA: Institute of Islamic and Arabic Sciences in America, forthcoming), p. 35