People must be familiar with Shalom Sharabi's Nahar Shalom  in which he reduces the Sepherot to three.

[You can't miss it because it is right smack on the first page.]

It is hard not to see the connection between this and Kant, Schelling, and Hegel. I don't make it a point to point out connections like this unless something comes up to remind me. Hegel's Triads are obviously isomorphic the the Reshash who has the actual sepherot being three as per the begining of Nahar Shalom. But Schelling and the Nahar Shalom have an obvious connection.  One has intellectual intuition. But considering that Schelling's intellectual intuition is half subject and half object and not really inside of oneself except as it is perceived it comes out that they are saying what seems to be the same thing.
Faith is needed to get to attachment with God --that is why Jews are called the "Hebrews" which means "to pass over." The original idea was because Jews came from beyond the Jordan from Iraq [Mesopotamia]. To get to the Infinite One one has to pass over --that is to go by faith, not by reason.

Friedrich Heinrich Jacobi  showed that a system of rational knowledge never arrives at the knowledge of God since, for such a system, the unconditioned can only arise as a result of a process where the one conditioned leads to other conditioned in an infinite chain of negativity. To get to Devekut [absolute attachment with] with the Unconditioned, one must begin with the Unconditioned itself  which no rational knowledge ever attains. For Jacobi it is only the leap of faith beyond the system of rational knowledge that enables us to open to the unconditionality of the absolute being.

In this context I should mention that I personally do not know how attachment with God happens and I would assume that one needs the ability to discern object facts from spiritual delusions before he can make progress in this area. I felt myself a great deal of attachment with God when I was in Israel the first time, but I could not say how that occurred, and it was always hard to deal with that kind of level of reality.  But later I learned to appreciate this kind of thing and to realize it has great value.
The way I see value in  a Schelling kind of way. That is I have a normal semi circle of values but with me it is dynamic not static. That is it is a harmonic oscillator.

[And the idea of Schelling about intellectual intuition is the exact same thing that the Intuitionists are defending.