aṣṭādaśa-varṣa - for eighteen years; kevala - only; nīlācale - in Jagannātha Purī; sthiti - staying; āpani - personally; ācari' - behaving; jīve - unto the living entities; śikhāilā - instructed; bhakti - devotional service.

For eighteen continuous years, Lord Śrī Caitanya Mahāprabhu remained at Jagannātha Purī and, through His personal behavior, instructed all living entities in the mode of devotional service.