Bhagavad Gita As It Is

References to text BG 18.33
BG 18.33: O son of Pṛthā, that determination which is unbreakable, which is sustained with steadfastness by yoga practice, and which thus controls the activities of the mind, life and senses is determination in the mode of goodness.

Text
Even while being insulted by these low-class men who were trying to effect his downfall, he remained steady in his spiritual duties. Fixing his resolution in the mode of goodness, he began to chant the following song.
The Song of the Avanti Brahmana.
SB 11.23.41