He, the creator and supporter of the gods, Rudra, the great seer, the lord of all, who saw, Hiranyagarbha being born, may he endow us with good thoughts.

In plain words: This is a prayer to Rudra, a name for God, who creates and supports the gods. He is the great seer who watched Hiranyagarbha, the first created being, be born. The prayer asks him to give us good thoughts.