CC Ādi 16.83

gaṅgāra mahattva — sādhya, sādhana tāhāra
viṣṇu-pādotpatti — ‘anumāna’ alaṅkāra
Word for word: 
gaṅgāra — of the Ganges; mahattva — opulences; sādhya — subject matter; sādhana — means; tāhāra — of that; viṣṇu-pāda-utpatti — her origin from the lotus feet of the Lord; anumāna — called anumāna (hypothesis); alaṅkāra — an ornament.
Translation: 
“The real glory of mother Ganges is that she has grown from the lotus feet of Lord Viṣṇu. Such a hypothesis is another ornament, called anumāna.