Śāṃśapāyani said:: When the Sandhyā (the period between two Yugas) elapsed along with the Kṛta Yuga, when (the time unit) called Kāla [kalā] began to function at the advent of Tretā Yuga, when the creation of rain had taken place and (the plants and) the medicinal herbs had grown, when the practice of cultivation. and agriculture had been fully established, when the people devoted to the stage of life of a householder established the classification of castes and stages of life with keen insight, then how was Yajña initiated after gathering together all the requisites?”