अथवा योगिनामेव कुले भवति धीमताम्। एतद्धि दुर्लभतरं लोके जन्म यदीदृशम् ॥

atha vā yoginām eva kule bhavati dhīmatām etad dhi durlabhataraṁ loke janma yad īdṛiśham

Or he may even be born into a family of wise Yogîs; but such a birth as that is most difficult to obtain in this world.

In plain words: Krishna says such a person might even be born into a family of wise yogis. But he adds that a birth like that is very rare in this world.