R. Abba bar Kahana said: Come and see the humility of the Holy One. What is written (in Ezek. 44:2)? AND THE LORD SAID UNTO ME: THIS EAST GATE WILL BE CLOSED AND WILL NOT BE OPENED … FOR THE LORD, THE GOD OF ISRAEL, HAS ENTERED IN BY IT. A King of flesh and blood has the glory of entering by a main gate and not by a lesser one, but the Holy One in his glory entered by a lesser gate. Ergo, it says (in Ps. 18:36): AND YOUR HUMILITY HAS MAGNIFIED ME.
The King Who Entered by the Closed Side Gate
Midrash Tanchuma Buber, Bereshit 4:4