CHĀNDOGYA UPANISHAD · 2.1.1

समस्तस्य खलु साम्न उपासनं साधु ।
यत् खलु साधु तत् सामेत्य् आचक्षते ।
यद् असाधु तद् असामेति ॥

samastasya khalu sāmna upāsanaṃ sādhu ।
yat khalu sādhu tat sāmety ācakṣate ।
yad asādhu tad asāmeti ॥

Meditation on the whole of the Sâman is good, and people, when anything is good, say it is Sâman; when it is not good, it is not Sâman.