मनःप्रसादः सौम्यत्वं मौनमात्मविनिग्रहः।भावसंशुद्धिरित्येतत्तपो मानसमुच्यते।।17.16।।
manaḥ-prasādaḥ saumyatvaṁ maunam ātma-vinigrahaḥ bhāva-sanśhuddhir ity etat tapo mānasam uchyate
Serenity of mind, good-heartedness, self-control, and purity of nature—this is called mental austerity.