B.G 3.17
yastvātmaratirēva syādātmatr̥ptaśca mānavaḥ। ātmanyēva ca santuṣṭastasya kāryaṁ na vidyatē ॥17॥
The human who delights with that essence alone, who is content with that essence alone, and who is satisfied in that essence alone, the lord, has no other duty to perform.
Gīta Tātparya 3.17
Even though words 'tr̥pti' and 'santōṣa' are synonymous, being content 'with the supreme lord' and 'in the supreme lord' are the specialities.
tr̥ptisantōṣaśabdayōḥ paryāyatvē'pi paramātmanā tr̥ptaḥ paramātmani tr̥ptaḥ iti viśēṣaḥ।
Even though words 'tr̥pti' and 'santōṣa' are synonymous, being content 'with the supreme lord' and 'in the supreme lord' are the specialities.
"viṣṇuprasādādratimān tr̥ptō viṣṇuprasādataḥ। viṣṇāvēvātitr̥ptaśca muktō'sau vidhyagōcaraḥ॥"
ityāgnēyē।
The lord Vishnu grants tranquility to one who delights and is content with the grace of Lord Vishnu. One who is intensely content with lord Vishnu alone gets liberated and is beyond the reach of ignorance.
-states Agni Purāna.
"ratirānanda uddiṣṭaḥ tr̥ptiśca kr̥takr̥tyatā। prītistu dvividhaḥ snēhaḥ karmajō nija ēva ca॥"
iti śabdanirṇayē।
"The happiness derived from love and aimed towards contentment is the accomplishment that needs to be accomplished. Indeed, the natural true affection is of two types, that of friendship, and that born because of receiving favourable action.
-states ancient dictionary 'śabdanirṇaya'
"santōṣaḥ truptirāpūrtiḥ prītiḥ paryāyavācakāḥ।"
ityabhidhānam ॥17॥
"Satisfaction ('santoṣaḥ'), contentment ('tṛptiḥ'), fulfillment ('āpūrtiḥ'), and love (prītiḥ) are synonymous."
-states another ancient dictionary 'abhidānam'.