The word ātmā, or self, is sometimes translated as "mind." Sometimes mental speculators present philosophical theories in different ways, but when they come in contact with saintly persons engaged in devotional service, they also become devotees.
Śrīmad-Bhāgavatam (10.87.18) describes the two classes of yogīs (sagarbha and nigarbha) as follows: “The yogīs begin their practice of yoga by worshiping the abdomen, and they try to concentrate their attention on their intestines. Gradually their meditation rises to the heart and they concentrate the mind there. Then they gradually direct their attention to the top of the head.