Astanga Hrudaya
उष्णं शीतं द्विधैवान्ये वीर्यमाचक्षतेअपि च। नानात्मकमपि द्रव्यमग्निषोमौ महाबलौ॥१७॥
Hence gurvadi 8 qualities are the viryas Dividha Viryas- Some other authors consider Ushna (hot) and Sheeta (cold) – only these 2 qualities as Veerya (potency).
english translation
uSNaM zItaM dvidhaivAnye vIryamAcakSateapi ca। nAnAtmakamapi dravyamagniSomau mahAbalau॥17॥
hk transliteration by Sanscript