Chapter 4, Verse 14

14. He made the letter Tav king over grace, and He bound a crown to it, and He combined one with another, and with them He formed Jupiter in the universe, the Sabbath in the year, the mouth in the soul (person), male and female.

The letter Tav stands for Torah and Teshuvah (repentance, return). Through the study of Torah, we bring an additional grace into our lives.

"The Torah bestows grace upon those who study it. -Eiruvin 54b"

"To him who is engaged in the study of the Torah by night, the Holy One extends a thread of grace by day. -Avodah Zarah 3b"

"Her ways are ways of pleasantness, and all her paths are peace (Prov. III, 17). 'These ways', he said, 'are the ways and paths of the Torah, as whoever walks in them is invested by the Holy One, blessed be He, with the grace of the Divine Presence as his constant accompaniment. -Zohar I, 197b"

"If a man is virtuous and studies the Torah day and night, then God weaves around him a thread of grace. -Zohar III, 76a"