Bhagavad Gita · Daivasura Sampad Vibhaga YogaChapter 16, Shloka 3 (16.3)

Shankaracharya. tejaḥ prāgalbhyaṃ na tvaggatā dīptiḥ — vigour = courage and boldness, not the glow of the skin; the difference between forgiveness and freedom from anger — in forgiveness the disturbance does not arise at all, while in freedom from anger the anger that has arisen is calmed; śaucaṃ dvividhaṃ — outer and inner; abhijāta = bhāvikalyāṇasya — one whose future is auspicious.

Ramanujacharya. tejaḥ durjanaiḥ anabhibhavanīyatvam — not being overpowered by the wicked; dhṛtiḥ mahatyām api āpadi kṛtyakartavyatāvadhāraṇam — holding on to one's duty even in great calamity.

Shridhara Swami. kṣamā paribhavādiṣūtpadyamāneṣu krodhapratibandhaḥ; dhṛtir duḥkhādibhir avasīdataś cittasya sthirīkaraṇam — steadying the mind when it sinks under sorrow; and abhijāta: bhāvikalyāṇasya puṃso bhavanti — one for whom good is yet to come.

Madhusudana Saraswati. Forgiveness = saty api sāmarthye paribhavahetuṃ prati krodhasyānutpattiḥ — no anger arising towards one who insults you, even when you have the power to retaliate; purity here is ābhyantaraṃ arthaprayogādau māyānṛtādirāhityaṃ — the absence of deceit and lies in money dealings. His definition of vigour also includes strībālakādibhir mūḍhair anabhibhāvyatvam — not being overpowered by women, children and fools.

Madhvacharya. kṣamā tu krodhābhāvena sahāpakartur anapakāraḥ — without anger, not harming the one who harmed you.