Sixteen categories of devotees
Sri Caitanya-caritamrta
CC Madhya-lila
On the path of spontaneous devotional service, there are also sixteen categories of devotees.
CC Madhya 24.292, Translation: “On the path of spontaneous devotional service, there are also sixteen categories of devotees. Thus there are thirty-two types of ātmārāmas enjoying the Supreme Lord on these two paths.