It's called metaphysical for a reason...

Religion is not within but beyond the limits of mere reason. Its task is not to compete with reason, to be a source of speculative ideas, but to aid us where reason gives us only partial aid. Its meaning must be understood in terms compatible with the sense of the ineffable. Frequently where concepts fail, where rational understanding ends, the meaning of observance begins. Its purpose is not essentially to serve hygiene, happiness, or the vitality of man; its purpose is to add holiness to hygiene, grandeur to happiness, spirit to vitality.

Spiritual meaning is not always limpid; transparency is the quality of glass, while diamonds are distinguished by refractive power and the play of prismatic colors.—Abraham Joshua Heschel in Moral Grandeur and Spiritual Audacity: Essays, 136–37 (emphasis original)