Question

Hello, honorable Rabbi!
In principle, for a long period I studied a lot of Talmud, but I decided to take a break from studying Talmud in order to ground myself a bit more in the Hebrew Bible (Tanakh) and Jewish thought. The point is that I mainly do my Bible studies with study partners, and I kind of want to take a break from Talmud; I feel that my desire right now is going in a different direction, which is also important. So that leaves me, for this coming Shavuot, to study thought/philosophy (and maybe I’ll also study the Book of Ruth).
The question is whether I can study thought/philosophy (for a Jewish purpose, which also includes non-Jewish thinkers), whether that belongs on Shavuot, or whether Shavuot is a day for the Torah of God itself and not for thought/philosophy (which also includes non-Jewish thinkers). 

Thank you very much, Rabbi!!
And Shabbat shalom