Matsyapurana 144.92

144.92

vistareṇānupūrvyācca namaskṛtya svayambhuve
pravṛtte tu tatastasmin punaḥ kṛtayuge tu vai //

The remaining people in Kaliyuga gradually begin to discriminate and they get dispassion (vairâgya) Thence, they realise their knowledge of self and they become religious So Satyayuga comes in to fulfil that which is to be done in future The people thus become happy and enjoy things with their equality of sight which they did not enjoy in the past Kali nor which they would enjoy in the future Tretâ Thus I bow down to Svāyambhuva and I have narrated to you in detail all the characteristics of the several yugas in due order—88 91

When the Satyayuga comes in its people are procreated by those who remained at the end of Kaliyuga The good and perfect persons that remained unnoticed amongst the Brâhmanas Ksatriyas, Vaisyas and Sûdras they and the Saptarṣis now give instructions in dharma to the new people In that way the doctrines of the Risis based on Śrutis and Smṛitis are propagated They promulgated Varnâsrama Dharma and other rituals on the lines of Śrutis and Smṛitis The Saptarṣis hold the dharma of the Śrutis and Smritis For promulgating dharma the Saptarṣis are ever ready in every Satyayuga These Risis are now existing for the period of one Manvantara As the roots of plants and trees vigorously germinate after being consumed by fire, similarly, there is a growth in the generation of people at the commencement of the Satya age. In this way, generations of the ages go on for ever The ideas appear and disappear. Comforts, life power, beauty, dharma, Artha and Kāma lose onefourth their quantity in every Yuga—92-100