Khandogya-Upanishad: Second Prapathaka, Fourteenth Khanda
1. Rising, the sun is the hinkara, risen, he is the prastava, at noon he is the udgitha, in the afternoon he is the pratihara, setting, he is the nidhana. That is the Brihat Saman as interwoven in the sun.
2. He who thus knows the Brihat as interwoven in the sun, becomes refulgent and strong, he reaches the full life, he lives long, becomes great with children and cattle, great by fame. His rule is, “Never complain of the heat of the sun.”