He, the creator and supporter of the gods, Rudra, the great seer, the lord of all, he who formerly gave birth to Hiranyagarbha, may he endow us with good thoughts.

In plain words: Rudra is the great seer and lord of all, who makes and supports the gods and who first gave birth to Hiranyagarbha, the golden source of creation. The speaker prays that he give us good thoughts.