Nanda Maharaja was thinking of Krsna's safety from the hands of demons like Putana and Sakatasura, and because he possessed such a son, he thought of himself as most fortunate

Expressions researched:
"Nanda Mahārāja was thinking of Kṛṣṇa's safety from the hands of demons like Pūtanā and Śakaṭāsura, and because he possessed such a son, he thought of himself as most fortunate"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Kṛṣṇa is the Supersoul, and Nanda Mahārāja is the individual soul. By the instructions of Garga Muni, both of them were blessed. Nanda Mahārāja was thinking of Kṛṣṇa's safety from the hands of demons like Pūtanā and Śakaṭāsura, and because he possessed such a son, he thought of himself as most fortunate.

SB 10.8.20, Translation and Purport

Śrīla Śukadeva Gosvāmī continued: After Garga Muni, having instructed Nanda Mahārāja about Kṛṣṇa, departed for his own home, Nanda Mahārāja was very pleased and considered himself full of all good fortune.

Kṛṣṇa is the Supersoul, and Nanda Mahārāja is the individual soul. By the instructions of Garga Muni, both of them were blessed. Nanda Mahārāja was thinking of Kṛṣṇa's safety from the hands of demons like Pūtanā and Śakaṭāsura, and because he possessed such a son, he thought of himself as most fortunate.