In plain words
Embodiments of Prema! The four Vedas have taken four forms and are at play in the house of Mahārāja Daśaratha. The Yajurveda, which shows Dharma itself in visible form and puts it into practice, is the very Veda that took on the form of Rāma. That is why Vālmīki described Him: “Rāmo vigrahavān dharmaḥ.” The Yajurveda is the Veda that arose to establish Dharma, to practise Dharma and to teach Dharma. Holding that to keep remembering and repeating the name of Rāmacandra without a break is itself yajña, the Ṛgveda itself, the form of mantra that has its principle chanted constantly, was born as Lakṣmaṇa. The Ṛgveda is the form of mantra. The essence of all mantras is the name of Rāma. That is why Lakṣmaṇa came down as the form of the Ṛgveda, to teach the world the path by which one is carried across through remembering the name of Rāma. While Lakṣmaṇa stood as the guide who carries the world across through remembrance, Bharata came down as the form of the Sāmaveda, to steal the heart of the world through song, win it, cross over and hold it spellbound. Singing the name of Rāma without a break, Bharata came down as the form of the Sāmaveda so that he might make his own the principle that set his heart burning. All feelings, all rāgas, every song came forth from this very Sāmaveda. Living by the command of these principles of the Ṛgveda, the Yajurveda and the Sāmaveda, as the embodiment of the principle that holds back the forces within and without, Śatrughna came down as the form of the Atharvaṇaveda.