But yet another thing is necessary, Purity of spirit; for an intelligence in repose without images, an intuition in the light of God, and a spirit elevated in Purity to the Face of God, these three qualities united constitute the true contemplative life, where none can err; for the pure spirit expands ceaselessly and follows rapidly in purified love, the enlightened intelligence towards its Cause.

p. 150 - The Seven Steps of the Ladder of Spiritual Love