In plain words
The Yajur Veda gathered up the essence of the Sāma Veda and sang it in the form of song.
With evil thoughts in the head, with ears that listen to slander, with eyes that lie in wait to spy, with a mind that listens at the doors, with a heart given to deceit, with speech that cheats, seeing these deformities, justice can live no longer, brother!
Only through the union of the three, Dharma, justice and Satya, do the three worlds shine. We are greatly neglecting the Veda that proclaimed this sacred truth.
The mantra is a blend of contemplation and life-breath
The Veda went on developing limbs of many kinds. These they called the branches. The first is the Mantra, the second the Brāhmaṇa, the third the Āraṇyaka, the fourth the Upaniṣads. It went on giving out, in an easy way, the truth that the mantra is a blend of contemplation and life-breath. It held that when a conversation took place about divinity, the very words were mantras. They taught that this belongs to the sādhana of brahmacarya. In humanness this is the chief foundation. For the building of four walls called brahmacarya, gārhasthya, vānaprastha and sannyāsa, this brahmacarya is the very first and is like the foundation. The gṛhastha, vānaprastha and sannyāsa stages rest on brahmacarya itself. So, in the time of brahmacarya in life, a person must turn his life into one filled with mantra. Mantra means sacred words.
O tongue, knower of tastes, lover of sweetness, I tell you the truth, the good, the highest: recite the sweet syllables Govinda, Dāmodara, Mādhava.