Äruruká¹£or muner yogaá¹
karma kÄraṇam ucyate
yogÄrÅ«á¸hasya tasyaiva
Å›amaḥ kÄraṇam ucyate
Äruruká¹£oḥ - of a person desiring to rise to the platform of yogic perfection; muneḥ - of a saintly person; yogam - spiritual knowledge; karma - work; kÄraṇam - the cause; ucyate - is said; yoga-ÄrÅ«á¸hasya - of one who has attained such perfect knowledge; tasya - for him; eva - certainly; Å›amaḥ - controlling the mind without being disturbed; kÄraṇam - cause; ucyate - is said.
texts 159 and 160 are from the Bhagavad-gÄ«tÄ (6.3-4).