Refined
Srimad-Bhagavatam
SB Cantos 10.14 to 12 (Translations Only)
SB 10.87.18, Translation:
Among the followers of the methods set forth by great sages, those with less refined vision worship the Supreme as present in the region of the abdomen, while the Āruṇis worship Him as present in the heart, in the subtle center from which all the prāṇic channels emanate. From there, O unlimited Lord, these worshipers raise their consciousness upward to the top of the head, where they can perceive You directly. Then, passing through the top of the head toward the supreme destination, they reach that place from which they will never again fall to this world, into the mouth of death.