The 'Shema' as it's known, is the penultimate prayer of Judaism. It is where man & Hashem are unity in complete oneness. This prayer is man's recognition that there is no other, the Creator is all there ever was and will be, and we are but His creations. We will one day return to Him, and that unity is ultimately reflected in the few words that comprise of the Shema.
"Hear, O Israel: the LORD our God, the LORD is one."
שְׁמַע יִשְׂרָאֵל יְ‑הוָה אֱ‑לֹהֵינוּ יְ‑הוָה אֶחָד
The Shema serves as a reminder, that our soul is at it's core, one with
G-d now and forever.