Evelyn Underhill, Mysticism - 17

"How many faces of Reality does he (the mystic) see?"

"Holy Spirit within...Transcendent Spirit without"

"...life as perceived by the human minds shows an inveterate tendency to arrange itself in triads;"

"...Pythagoras call Three the number of God..."

"Man, that 'thing of threes,' of body, soul and spirit..."

Christopher Hervey:

"The whole world round is not enough to fill
The heart's three corners, but it craveth still.
Only the Trinity that made it can
Suffice the vast triangled heart of Man."

Evelyn Underhill, Mysticism - 5

p. 33: "We must," says Plato in the 'Timaeus,' make a distinction of the two great forms of being, and ask, 'What is that which Is and has no Becoming, and what is that which is always becoming and never Is?"

Sounds like God (Is), and us (always becoming). I believe it is John Macquarrie whose name for this, and for God, is Letting-Be. It is the practice of mysticism that prepares us for our becoming, by the subtle (okay, sometimes not so subtle) I Am.