SpiritualFamily.Net

As a reality in human spiritual experience God is not a mystery. But when an attempt is made to make plain the realities of the spirit world to the physical minds of the material order, mystery appears: mysteries so subtle and so profound that only the faith-grasp of the God-knowing mortal can achieve the philosophic miracle of the recognition of the Infinite by the finite, the discernment of the eternal God by the evolving mortals of the material worlds of time and space. 1:4.7
https://mm.spiritualfamily.net/Urantia_Book-Online_Reader-2019/Paper_001.html#1:4.7