Chasidut zu Schir haSchirim 2:9

When, with God’s help, we are worthy of doing the avodah of Chassidus, and allow a slight revelation of our souls, then in states of elevated consciousness, when our souls burn beyond the constrictions or our shadows and the confines of our bodies, it will be possible at times to see the majestic brilliant, shining light of the world flash before us. We will not just know through the mind’s meditations, nor will we only know and see what is lacking in our perception, namely knowing that our material existence is like a baseless shadow. Yet we will actually see through the eyes of your soul, on the level of, “peering through the cracks,”²²⁰Shir HaShirim, 2:9 Like looking through slight cracks in a wall, we may be privileged to see the Divine essence that is largely concealed by the wall of the physical world and the senses. seeing both the Divine essence and the source of the shadow. According to my limited human understanding, we will not be able to intellectually identify what it was that flashed before us, because such is the nature of the limitations of the human intellect, and can only understand mortal and finite matters. But we will know with the soul, and we will be sure that we glimpsed the shining of the world cast from the illumination that the Master of the world.

When you begin to pray, as soon as you utter the words "Adonai Sefatai Tiftach, God, open my lips" - in this moment the Shechina adorns you and speaks through you. If you truly trust that it is the Shechina speaking these words, surely great dread and fear will fall upon you. Even the Holy One, in a way, constricts God's being and dwells with you. This is as it says (Song of Songs 2:9) "Peeking through the lattice," - these are the letters, which are chambers, and you journey from one chamber to the other, and in each chamber you are judged whether you are worthy to enter. If you would notice that you are being judged at every instance when a foreign thought enters your mind, you would certainly pray with fierce attunement. But sometime you forget that you are being judged.