CC Antya 2.14
tāhāra darśane ‘vaiṣṇava’ haya sarva-deśe
Thus He empowered living beings [His pure devotees] by manifesting in them so much of His own devotion that people in all other countries became devotees by seeing them.
As stated in the Caitanya-caritāmṛta (Antya 7.11):
kṛṣṇa-śakti vinā nahe tāra pravartana
Unless one is empowered by the Supreme Personality of Godhead, Śrī Caitanya Mahāprabhu, one cannot spread the holy names of the Hare Kṛṣṇa mahā-mantra throughout the world. Persons who do so are empowered. Therefore they are sometimes called āveśa-avatāras, or empowered incarnations, for they are endowed with the power of Śrī Caitanya Mahāprabhu.