Swami Chinmaynanda's Commentary on Bhaja Govindam (Part 2)

Stranza 13 - page 50:

Physical self-control (dama - दमा) brings about mental peace (sama - समा), which creates a satisfying inner joy (santosa - संतोष) of the spiritual heart. With such an inner instrument alone can sincere self-study (svadhyaya -स्वाध्याय)  and reflection (vichara -विचार)  be undertaken with assurance of creditable profit.