Studying philosophy is for boys.
Studying the occult is for men.
But all men are boys at heart so it is advisable to study both in conjunction.
N.B. - Of course the occult lends itself to very immature and wrong-headed readings. It strikes me, however, that many of the established philosophers of the tradition were not explicitly in touch with the symbolic wealth of the Mystery Traditions and failed to grasp the occult and therefore the ancient origins of Metaphysics which have a logic based in natural law principles that take into account the finitude and limitations of human reason as compared to the All.
It seems to me that the likes of Kant, Nietzsche and Heidegger attacked a straw-man version of metaphysics, ignorant of its roots in deep philosophical understanding as well as humility. Plato himself has been claimed to be, at least by Manly P. Hall in Secret Teachings of All Ages, an initiate of Egyptian and Greek Mysteries and was apparently accused of revealing too much in his work to the profane.
An understanding of occult symbols, meanings and principles can only serve the cause of better philosophising and a practiced ability at philosophising can only increase the quality of one's occult and esoteric readings/interpretations. For occult symbols are rich in philosophical meaning and therefore in truth, if one should define truth, as I once did, as that which makes meaning possible (Lathoron, A Philosophical Dialogue).
Put differently, many of the big names of philosophy seemed to be unaware of the occult origins of their own metaphysical understanding not to mention the tradition of philosophy itself which is why reading the books of occult researchers such as Manly P. Hall and others is a corrective and useful complement to the reading up on the Spinozas and Hegels of this world.