Ashtangahridayasamhita 1.1.65: Sarvāṅgasundarā

1.1.65.1

tatra tasmin dravye, vīryaṃ dvividham| viṃśaterguṇānāṃ madhyāddvāvuṣṇaśītau, tadutkarṣādvīryamiti sarvāyurvedaprasiddhau, dvāveva guṇau śītoṣṇau vīryakaraṇahetū| vīryaṃ śaktiḥ| uṣṇaguṇotkarṣa uṣṇaguṇātiśaya eva kaściduṣṇavīryākhyāṃ labhate| tathā śītaguṇotkarṣaḥ śītaguṇātiśaya eva śītavīryākhyām| yadyapi nānātmakamapi dravyaṃ, tathāpyagnīṣomātmakatvājjagato dvidhaiva vīryam|