The mitzvah of tefillin alludes to Torah, the Tribes and G-d.
Beginner
Jacob's Higher Self Jacob's second name, "Israel", represents a state of perfection. From the Ohr HaChaim commentary by Rabbi Chaim (ben Moshe) Ibn Atar
Intermediate
Kindness and Truth By Rabbi Isaiah Horowitz; adapted from Shenei Luchot HaBrit by Eliyahu Munk
True kindness anticipates no reward
Two Sets of Seventeen Whenever Jacob experienced spiritual serenity, he was qualified to be called Israel. Translated and annotated by Rahmiel-Hayyim Drizin from PaRDeS HaBahir
Embalmed Alive? Thirty days before death, a person's Tzelem/image is removed from him and his shadow no longer appears. Translated and annotated by Rahmiel-Hayyim Drizin from PaRDeS HaBahir