Bhagavad Gita Chapter 17 Verse 16
भगवद् गीता अध्याय 17 श्लोक 16

मनःप्रसादः सौम्यत्वं मौनमात्मविनिग्रहः।
भावसंशुद्धिरित्येतत्तपो मानसमुच्यते।।17.16।।



English Translation - Swami Sivananda
17.16 Serenity of mind, good-heartedness, self-control, purity of nature  this is called mental austerity.


English Translation of Sanskrit Commentary By Sri Shankaracharya's
17.16 Manah-prasadah, tranillity of mind, making the mind free from anxiety; saumyatvam, gentleness-that which is called kindliness of spirit, [Kindliness towards all, and also not entertaining any evil thought towards anybody.] a certain condition of the mind resulting in calmness of the face, etc.; maunam, reticence-since even the control of speech follows from the control of mind, therefore the cause is implied by the effect; so maunam means control of the mind; [Or, maunam may mean thinking of the Self, the attitude of a meditator. The context being of mental austerity, reticence is explained as control of the mind with regard to speech.] atma-vinigrahah, withdrawal of the mind-withdrawal of the mind in a general way, from everything; maunam (control of the mind) is the minds withdrawal with regard to speech alone; this is the distinction-; bhava-samsuddhih, purity of heart, absence of trickery while dealing with others; iti etat, these are; what is ucyate, called; manasam, mental; tapah, austerity.
How the above-described bodily, verbal and mental austerities undertaken by poeple are divided into three classes-of sattva etc.-is being stated:


Transliteration Bhagavad Gita 17.16Manahprasaadah saumyatwam maunamaatmavinigrahah;
Bhaavasamshuddhirityetat tapo maanasamuchyate.


Word Meanings Bhagavad Gita 17.16manaḥ-prasādaḥ—serenity of thought; saumyatvam—gentleness; maunam—silence; ātma-vinigrahaḥ—self-control; bhāva-sanśhuddhiḥ—purity of purpose; iti—thus; etat—these; tapaḥ—austerity; mānasam—of the mind; uchyate—are declared as