Unity of Divine Attributes

Source - The Qur'an in Islam, Page (128), by Sayyid Muhammad Hussain Tabataba'I

If we analyze the nature of a human being, we see that he has an essence which is his individual humanity and also qualities through which his essence is known, such as the quality of being born in such a land, or being the son of such a person, or being learned and capable, or tall and handsome; or he possesses the contrary of these qualities. Some of these qualities, like the first and second, can never be separated from the essence, and others, like being learned or capable, have the possibility or separation and alternation. Yet all are different from the essence and at the same time different from each other.
This point, namely the difference between the essence and qualities and between the qualities themselves, is the best proof that an essence that has qualities, and a quality that makes known an essence, are both limited and finite. For if the essence were limitless and infinite it would encompass the qualities as well, and also the qualities would include each other, and as a result all would become one. For example, the essence of man would be the same as capability and also capability the same as knowledge; height and beauty would be the same; and all of these would possess the same meaning.
From this example it is clear that the Divine Essence cannot be conceived to have qualities in the sense that human beings have qualities. A quality can come about only through setting limits and the Divine Essence transcends all limitations (even the limitation of this transcendence which in reality is a quality).

The Meaning of the Divine Qualities

In the world of creation we are aware of many perfections which appear in the form of qualities. These are positive qualities which, wherever they appear, make the object of which they are the quality more perfect and increase its ontological value, as can be seen clearly in the comparison between the live being such as man and a lifeless one such as a stone. Doubtless God has created and bestowed these perfections upon creatures; if He had not possessed them in their fullness Himself He could not have bestowed them upon others and perfected others through them. Therefore, if we follow the judgment of sound reasoning we must conclude that God, the Creator, has knowledge, power, and every other real perfection. Furthermore, as has already been mentioned, the marks of His knowledge and power and, as a result, the marks of life are seen in the order of the cosmos.
But because the Divine Essence is limitless and infinite these perfections which are shown to be His Qualities are in reality the same His Essence and one with each other. The difference observed between the Essence and the Qualities and at the same time between the Qualities themselves is only on the plane of concepts. Essentially there is but one Reality involved which is one and indivisible.
In order to avoid the inadmissible error of limiting the Essence through attributing qualities to it or denying the principle of perfection in it, Islam has commanded its followers to preserve a just balance between affirmation and negation. It has ordered them to believe that God has knowledge but not like the knowledge of others. He has power but not like the power of others. He hears but not with ears. He sees but not with eyes like those of men, and so on.