One verse

Bhagavad Gita 17.16

17.16

मनः प्रसादः सौम्यत्वं मौनमात्मविनिग्रहः | भावसंशुद्धिरित्येतत्तपो मानसमुच्यते ||१७-१६||

manaḥ prasādaḥ saumyatvaṃ maunamātmavinigrahaḥ . bhāvasaṃśuddhirityetattapo mānasamucyate ||17-16||

manaḥ-prasādaḥ
satisfaction of the mind
saumyatvam
being without duplicity towards others
maunam
gravity
ātma
of the self
vinigrahaḥ
control
bhāva
of one’s nature
saṁśuddhiḥ
purification
iti
thus
etat
this
tapaḥ
austerity
mānasam
of the mind
ucyate
is said to be

And satisfaction, simplicity, gravity, self-control and purification of one’s existence are the austerities of the mind.