Abstract concepts are empty in themselves.
In a sense, they are "filled" by intuitive knowledge, which by itself is nothing.
It is only when a concept is filled with the intuitive matter that we can call it a truth.
Collecting intuitive knowledge in solid, stable concepts is the best thing a man can do, for solid concepts can last well enough for the duration of a lifetime, and contain a considerable quantity of tangible knowledge.
Psychanalysis uses the same process, for it's goal is to assess the mental state of an individual with the use of knowledge contained in concepts.
I'm confident in the fact that the concepts of will and representation are suitable for such a task, for I can already guess that what we call a nevrosis is a conflict between the universal, metaphysical Will and individual representations.
If an individual representation doesn't fit the character of the will, dissonances appear. The representation, which is the only variable between all beings, oscillates and is in interference with the will. It then seems apparent that the job of the psychanalyst is to reduce these interferences in order to help the patient get a better representation of the will.