Be at peace with your own soul
then heaven & earth will be at peace with you.
Enter eagerly into the treasure house
that is within you,
And you will see the things that are in heaven,
for there is but one single entry to them both.
The ladder that leads to the Kingdom
is hidden within your soul...
Dive into yourself and in your soul
and you will discover the stairs by which to ascend.
Isaac the Syrian
Christian monk from Beth Abhe on the western shore of the Persian Gulf. A renowned teacher who briefly became Bishop of Nineveh, abdicated and then lived for many years as a desert ascetic. Seventh century CE.
St Isaac the Syrian, a theologian of love and mercy
Isaac of Syria (OrthodoxWiki)