अथ यदास्य वाङ्मनसि सम्पद्यते मनः प्राणे प्राणस्तेजसि तेजः परस्यां देवतायामथ न जानाति ॥ ६.१५.२ ॥
In plain words
But when his speech has been gathered into the mind, the mind into the breath, the breath into heat, and heat into the highest deity, then he does not know.