Consciousness, no matter how extensive it may be, must always remain the smaller circle within the greater circle of the unconscious, an island surrounded by the sea; and, like the sea itself, the unconscious yields an endless and self-replenishing abundance of living creatures, a wealth beyond our fathoming.
The circular sea with no outlet, which perpetually replenishes itself by a spring bubbling up from its center, is to be found in Nicolas de Cusa as an allegory of God. ~Carl Jung, CW 16, Para 366