Skandapurana 16.118.16

16.118.16

evaṃ te kathitaṃ devi rahasyaṃ jñānasaṃbhavam ..
evaṃ yo veda puruṣaḥ sa jñeyo vaiṣṇavo budhaiḥ .. 16 ..

Thus has the secret born of wisdom been told to you, O goddess. / The man who understands it thus is to be known as a Vaiṣṇava by the wise.