Caitanya-caritāmṛta 9.16
madhya-mūla paramānanda purī mahā-dhīra aṣṭa dike aṣṭa mūla vṛkṣa kaila sthira
[madhya-moola paramaananda puree mahaa-dheera ashta dike ashta moola vriksha kaila sthira]
Blended reading (Sanskrit + English inline)
madhya-mūla paramānanda purī mahā-dhīra aṣṭa dike aṣṭa mūla vṛkṣa kaila sthira
With the sober and grave Paramānanda Purī as the central root and the other eight roots in the eight directions, the tree of Caitanya Mahāprabhu stood firmly.
My note
Source: vedabase.io