महर्षयः सप्त पूर्वे चत्वारो मनवस्तथा। मद्भावा मानसा जाता येषां लोक इमाः प्रजाः ॥

maharṣhayaḥ sapta pūrve chatvāro manavas tathā mad-bhāvā mānasā jātā yeṣhāṁ loka imāḥ prajāḥ

The seven great Rishis, the ancient Four, and also the Manus, were born of My nature, and mind; of them this race was generated.

In plain words: Krishna says the seven great sages, the four ancient ones and the Manus, the first fathers of humankind, were born from his mind. All people come from them.