My dear brother Nanda Mahārāja, at an advanced age you had no son at all and were hopeless of having one. Therefore, that you now have a son is a sign of great fortune.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
दिष्ट्या भ्रातः प्रवयस इदानीमप्रजस्य ते । प्रजाशाया निवृत्तस्य प्रजा यत्समपद्यत
diṣṭyā bhrātaḥ pravayasa idānīmaprajasya te | prajāśāyā nivṛttasya prajā yatsamapadyata
SB 10.5.23