ते वा एते गुह्या आदेशा एतद्ब्रह्माभ्यतपस्तस्याभितप्तस्य यशस्तेज इन्द्रियवीर्यमन्नाद्यं रसोऽजायत ॥ २ ॥
In plain words
Those secret instructions focused in deep meditation upon Brahman. From that concentrated meditation arose the essence of glory, energy, sensory power, vitality, and nourishment.
Close to the Sanskrit
Those very hidden instructions concentrated upon this Brahman; of that concentrated [Brahman], glory, energy, sensory power, vitality, and food-essence was born.