Based on the context here, it seems that the idea that kephalé (head) means "source," as in the head of a river, is what Paul has in mind.
ອີງໃສ່ສະພາບການຢູ່ທີ່ນີ້, ມັນເບິ່ງຄືວ່າຄວາມຄິດນັ້ນ kephalé (ຫົວ) ຫມາຍ ເຖິງ" ແຫຼ່ງ," ຄືກັບໃນຫົວຂອງແມ່ນ້ ໍາ, ແມ່ນສິ່ງທີ່ໂປໂລມີຢູ່ໃນໃຈ.