The Self that is not a soul is a secular thing.

With Kant all you really have is knowledge based on observation or not based on observation. [a posteriori or a priori].
This comes from Hume. But this to a large degree accepts a very secular idea of the ''self''. The Self that is not a soul is a secular thing. It has no spiritual intuitions, spiritual connections.
This creates a very false self image of what a person is or ought to be for every single individual. It does not automatically deny knowledge based on spiritual intuition but it does so by implication.

This means that people looking into their own lives and trying figure out things tend to miss a significant aspect of their own self being that they can not take into account because they believe it has no relevance nor even reality. Even when they are interested in Torah this makes them incapable of accounting for what they might be doing right or wrong. They also will tend to look at others as selves, but not souls. [Allen Bloom went into this in great depth in his book The Closing Of The American Mind].

In my own case there were spiritual connections that I had with my parents and Israel and Torah and the Infinite Light  of the Divine Presence, that I ignored because of not being able to take them into account in my mental processing. That led me to ignore the most significant aspects of Torah.  

This is not to minimize the danger of the fact that all intuitions are subject to error. The Sitra Achra [the realm of Evil] we already know has great power to make itself seems sweet and lovely for the moment, though in the end it is bitterness and gall.