Khandogya-Upanishad: Second Prapathaka, First Khanda
1. Meditation on the whole of the Saman is good, and people, when anything is good, say it is Saman; when it is not good, it is not Saman.
2. Thus they also say, he approached him with Saman, i.e. becomingly; and he approached him without Saman, i.e. unbecomingly.
3. And they also say, truly this is Saman for us, i.e. it is good for us, when it is good; and truly that is not Saman for us, i.e. it is not good for us, when it is not good.
4. If any one knowing this meditates on the Saman as good, depend upon it all good qualities will approach quickly, aye, they will become his own.