As a Child

So Aquinas' Summa Theologica is pretty complicated, and its very size may convince some that the theology is very complicated.  But the Summa seeks to prove that God is ultimately simple.  Perfectly simple.  This is also Dante's conclusion in Paradiso (the third part of the Divine Comedy), that God is infinite, but infinitely small.

So the simple minded, like a child, have an advantage over the learned in understanding God.  Sort of the opposite of what the gnostics claimed.