Although very ferocious, the lioness is very kind to her cubs. Similarly, although very ferocious to nondevotees like Hiranyakasipu, Lord Nrsimhadeva is very, very soft and kind to devotees like Prahlada Maharaja

Expressions researched:
"Although very ferocious, the lioness is very kind to her cubs. Similarly, although very ferocious to nondevotees like Hiraṇyakaśipu, Lord Nṛsiṁhadeva is very, very soft and kind to devotees like Prahlāda Mahārāja"

Sri Caitanya-caritamrta

CC Madhya-lila

“‘Although very ferocious, the lioness is very kind to her cubs. Similarly, although very ferocious to nondevotees like Hiraṇyakaśipu, Lord Nṛsiṁhadeva is very, very soft and kind to devotees like Prahlāda Mahārāja.’”

CC Madhya 8.6, Translation and Purport

“‘Although very ferocious, the lioness is very kind to her cubs. Similarly, although very ferocious to nondevotees like Hiraṇyakaśipu, Lord Nṛsiṁhadeva is very, very soft and kind to devotees like Prahlāda Mahārāja.’”

This verse was composed by Śrīdhara Svāmī in his commentary on the Seventh Canto of Śrīmad-Bhāgavatam (SB 7.9.1).