There are three aspects of in the Veda-s; Deva-s, Rishi-s, and Mantra-s. Deva-s are the cosmic energies. When we invoke them, they will manifest their powers in us. Various Deva-s have their own powers prominently. These powers enhance potentiality like willpower, clarity in thinking, inspiration, etc.
Herein I have introduced Agni Deva. He is the lord of willpower. By understanding and chanting these mantras we can empower our willpower. First Sukta of First Mandala of Rig Veda addresses Agni. First I will paraphrase the nine mantra-s of first Sukta, then I will try to explain each mantra. This is psychological meaning.