“Enter eagerly into the treasure-house that lies within you,
and so you will see the treasure-house of heaven:
for the two are the same,
and there is but one single entry to them both.
The ladder that leads to the Kingdom is hidden within you,
and is found in your own soul.
Dive into yourself and in your soul you will discover the rungs by which to ascend.”
(St. Isaac the Syrian in The Art of Prayer: An Orthodox Anthology, pg.164)