Bhagavad Gita 17.16

मनःप्रसादः सौम्यत्वं मौनमात्मविनिग्रहः।भावसंशुद्धिरित्येतत्तपो मानसमुच्यते॥

manaḥprasādaḥ saumyatvaṃ maunamātmavinigrahaḥ |bhāvasaṃśuddhirityetattapo mānasamucyate ||

Serenity of mind, good-heartedness, self-control, and purity of nature—this is called mental austerity.

Serenity, kindness, silence, self-control, and purity—these are the austerities of the mind.

Our plain-language meaning of this verse is waiting for scholar review.