Devibhagavatapurana 4.2.19

4.2.19

yuge yugeṣvanekāsu nīcayoniṣu tatkatham |
tyaktvā vaikuṇṭhasaṃvāsaṃ sukhabhogānanekaśaḥ ||

Now, if the birth of Visnu, of infinite prowess, takes place according to His will, then why is it that He travels through many impious births? Why is it that Bhagavân Visnu goes, in different Yugas, to take His births in low, vile origins?
Where is that self dependent man, who, leaving his abode Vaikuntha and all sorts of pleasures and happiness, desires to live in this mortal temple, filled with urine, faeces and other filthy matters.