Tranquility of mind, gentleness, silence, self-restraint, And extreme purity of being (bhāva); this is called the austerity (tapas) of the mind.
Mental serenity, kindness, silence, self-restraint, and purity of being is called mental penance.
(16) Serenity of mind and friendliness, silence and self-restraint, and the cleansing of one's affections,—this is called the penance of the mind.
17.16 Tranquility of mind, gentleness, reticence, withdrawal of the mind, purity of heart,-these are what is called mental austerity.
17.16 Serenity of mind, benevolence, silence, self-control, purity of mind --- these are called austerity of the mind.
17.16 Serenity of mind, good-heartedness, self-control, purity of nature -- this is called mental austerity.