I'm very sorry for my weak English. This is an automatic translation of opening fragment from the text called "Orientation - North".
This is the doctrine of radical dualism, which considers monism, which Leo defends, as anti-spiritual teaching. Monism rejects the truly transcendental. On the contrary, it teaches about the total immanetism of the reality.
1. The relation of reality to the absolute is a universal problem of the spirit.
2. Depending on the solution of this problem, the fate of the authenticity of the spirit is decided.
3. If the reality as a whole is truly absolute, the spirit is ephemeral.
4. Such a conclusion is inevitable, since the specificity of the spirit lies in its claim to a certain particularity.
5. This feature of the spirit consists in its non-identification with the elements of global inertia.
6. Thus, the spirit, as an active principle, is in a certain opposition to reality.
7. In relation to absolute reality, such opposition would be reduced to an empty illusion.
8. In this case, the reality would include the spirit as the continuation of its own all-encompassing peace.
9. The nature of the spirit would then not have a fundamental qualitative difference from all other aspects of reality.
10. This means that all the difference between the non-spiritual and the spiritual would be reduced to a difference in degree.
11. The spiritual would be in this case the active essence of the unspiritual, the maximum inertia that characterizes reality.
12. For such a spiritual principle, the very idea of its specialness would in principle be impossible.
13. Thus, the very position of the independence of the spirit from reality already indicates that reality is not absolute.
So, you have this intuition, you can feel the absurdity of the monistic doctrine, which teaches us about total meaningless of existence at all.
This is interesting, that you you quote the Quran, because Islam particularly emphasizes the strict non-identity of God and His creation. If we say, that Being (or Absolute Infinity) exists, than God DOES NOT exists. But this "DOES NOT" is affirmative!
Leo often repeats that nothing exists beyond Absolute Infinity, because it would be automatically included in It. Yes, yes! So, true GOD, whis "is" veritable transcendental Subject, this God DOES NOT exists, because HE is Creator of this Being, which is ALL, that exists. If Absolute Infinity is effulgent ALL [that possible], than transcendental Subject is black abyss of the Impossible.
Abrahamic doctrines affirm the eternal striving towards the Unknowable God, which is the Meaning and the great Miracle. Absolute Infinite is something which should be surpassed. Absolute Infinite — is Lucifer itself, the Great Being, the Master of the Clay, Ishvara, Prince of this world.
That's it. And sorry again for my bad English, it is so profound and important topic, but it's hard for me to write clearly.