Caitanya-caritāmṛta 24.291
ajāta-rati sādhaka-bhakta, — e cāri prakāra vidhi-mārge bhakte ṣoḍaśa bheda pracāra
[ajaata-rati saadhaka-bhakta, — e chaari prakaara vidhi-maarge bhakte shodasha bheda prachaara]
Blended reading (Sanskrit + English inline)
ajāta-rati sādhaka-bhakta, — e cāri prakāra vidhi-mārge bhakte ṣoḍaśa bheda pracāra
“Within the category of regulative devotional service, there are also immature devotees. These are also of four varieties. Thus in regulative devotional service there are altogether sixteen varieties.
My note
Source: vedabase.io