Chandogya Upanishad 2.16

vasanto hiṅkāraḥ grīṣmaḥ prastāvaḥ varṣā udgīthaḥ śarat pratihāraḥ hemanto nidhanam etad vairājam ṛtuṣu protam

The hinkâra is spring, the prastâva summer, the udgîtha the rainy season, the pratihâra autumn, the nidhana winter. That is the Vairâga Sâman, as interwoven in the seasons.

sa ya evam etad vairājam ṛtuṣu protaṃ veda virājati prajayā paśubhir brahmavarcasena sarvam āyur eti jyog jīvati mahān prajayā paśubhir bhavati mahān kīrtyā ṛtūn na nindet tad vratam

He who thus knows the Vairâga, as interwoven in the seasons, shines (virâgati) 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.'