Chapter 6 · verse 42 · gita.yoga.org

Bhagavad Gita 6.42

अथवा योगिनामेव कुले भवति धीमताम्। एतद्धि दुर्लभतरं लोके जन्म यदीदृशम्

Or he is born in a family of even the wisest of yogis; verily, such a birth is very difficult to obtain in this world.