"Do not say that it is impossible to receive the Spirit of God. Do not say that it is possible to be made whole without Him. Do not say that one can possess Him without knowing it. Do not say that God does not manifest Himself to man. Do not say that men cannot perceive the divine light, or that it is impossible in this age! Never is it found to be impossible, my friends. On the contrary, it is entirely possible when one desires it" (Hymn 27, 125-132).
Here's part of his Invocation to the Holy Spirit:
Come, true light.
Come, life eternal.
Come, hidden mystery.
Come, treasure without name.
Come, reality beyond all words.
Come, person beyond all understanding.
Come, rejoicing without end.
Come, light that knows no evening.
Come, unfailing expectation of the saved.
Come, raising of the fallen.
Come, resurrection of the dead.
Come, all-powerful, for unceasingly you create, refashion and change all things by your will alone.
Come, for your name fills our hearts with longing, and is ever on our lips.
Come, for you are yourself the desire that is within me.
Come, my breath and my life.
Come, the consolation of my humble soul.
Come, my joy, my glory, my endless delight.