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

मनःप्रसादः सौम्यत्वं मौनमात्मविनिग्रहः।
भावसंशुद्धिरित्येतत्तपो मानसमुच्यते।।17.16।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 17.16)
।।17.16।।मनकी प्रसन्नता? सौम्य भाव? मननशीलता? मनका निग्रह और भावोंकी शुद्धि -- इस तरह यह मनसम्बन्धी तप कहा जाता है।


Shri Vaishnava Sampradaya - Commentary

The austerities of the mind are  manah-prasadah  or  self  satisfaction  and
serenity  free from mental imbalances. The word  saumyatvam  means  serenity
and benevolence to others.  Maunam  is  silence  externally  and  reflecting
internally. Atma-vinigrahah is self-controlling the mind to stay focused  on
realisation of the atma. Bhava-samsuddhih is purity  within  and  purity  of
purpose. These austerities of mind are confirmed by Lord Krishna  to  be  in
sattva guna the mode of goodness.