"The Luminary of Torah" refers to the teachings of the inner dimension of Torah, particularly Kabbalah and Chasidus. These teachings reveal the hidden, spiritual aspects of Torah that illuminate the soul and provide deeper insights into Divine wisdom. Through the study of Chasidus, one gains access to this "light" that transforms the intellect and heart, guiding a person toward greater connection with Hashem and a deeper understanding of the spiritual essence behind the Torah and mitzvot.