B.G 6.42

अथवा योगिनामेव कुले भवति धीमताम्। एतद्धि दुर्लभतरं लोके जन्म यदीदृशम् ॥४२॥

athavā yogināmeva kule bhavati dhīmatām। etaddhi durlabhataraṁ loke janma yadīdr̥śam ॥42॥

[अथवा योगिनाम् एव कुले भवति धीमताम्। एतत् हि दुर्लभतरं लोके जन्म यत् ईदृशम्॥
अथवा (athavā) - or; योगिनाम् (yoginām) - of yogis; एव (eva) - indeed; कुले (kule) - in the family; भवति (bhavati) - one is born; धीमताम् (dhīmatām) - of the wise and adept; एतत् (etat) - this; हि (hi) - indeed; दुर्लभतरम् (durlabhataraṁ) - more rare; लोके (loke) - in the world; जन्म (janma) - birth; यत् (yat) - which; ईदृशम् (īdṛśam) - like this;]

Or one is born into a family of wise and adept yogis. Such a birth is indeed very rare in this world.