Khandogya-Upanishad: Second Prapathaka, Sixteenth Khanda

1. The hinkara is spring, the prastava summer, the udgitha the rainy season, the pratihara autumn, the nidhana winter. That is the Vairaga Saman, as interwoven in the seasons.

2. He who thus knows the Vairaga, as interwoven in the seasons, shines (viragati) through children, cattle, and glory of countenance. He reaches the full life, he lives long, becomes great with children and cattle, great by fame. His rule is, “Never complain of the seasons.”