Bhagavad Gita 6.42
अथवा योगिनामेव कुले भवति धीमताम्।
एतद्धि दुर्लभतरं लोके जन्म यदीदृशम्।।6.42।।
Athava yoginameva kule bhavati dhimatam
Etaddhi durlabhataram loke janma yadidrisham
Simple meaning, written by AIOr he is born into a family of wise yogis, and such a birth is very rare in this world.