"A Deep Indicator"
A Yid commenting on On His Yahrzeit:
Ari za"l says, that one has to complete his learning in course of his gilgulim. If he feels attraction to certain field of study, it indicates, that this field was neglected by him in his previous gilgulim (if any), so now his neshomo arouses this urge to learn what it missed before, so the rule of "ma sheliboy chofeytz" according to mekubolim is really a deep indicator of what is missing for neshoma's tikun.
A Simple Jew responds:
I found this idea to be fascinating and hope we can explore this in more depth in the future.
I once heard the story that the Chozeh of Lublin had a thought that he shouldn't concentrate so much on learning Gemara. The Chozeh of Lublin, however, instantly redoubled his efforts in learning Gemara because he realized that this thought trying to discourage him most likely came from the yetzer hara. From this, he also came to understand how very precious a person's learning of Gemara was to Hashem.
While an attraction to a specific field of learning is deeply rooted in the neshoma, we can not attribute the inclination not to learn something to a source of kedusha. This follows Rabbi Yaakov Meir Shechter's teaching, "Holiness never comes to destroy, it only comes to build."