Adhataman, Adhibhuta, Adhidaiva, Adhiyajna : this quartet constitutes the quintessence of natural and supernatural knowledge which, intelligently filtered in a receptive mind, becomes wisdom.
Adhyatman (adhi-atman : pervader of atman). Adhibhuta (pervader of all creatures). Adhidaiva (pervader of the gods). Adhiyajna ( pervader of ritual deeds).
Behind the technical philosophical terminolory, the meaning is clear. The Supreme Ultimate Brahman is the energising principle behind the individual atman, the Fire, of which the atman is a spark. Brahman also energises the vast variety of physical life. Brahman charges the creative imagination of the morally noble and god-like. Brahman inspires the dedicated selflessness that goes into ritual acts such as sacred offering and sacrifices. The key shloka 15 of Canto VIII applies to a person who has this wisdom : 'For such a pure soul (mahatma) there is no more the sorrow of rebirth.'
No commentator has satisfactorily glossed the two sholokas that speak of Time that makes the yogis return to the world (by the dark path) and not return (by the bright path). Perhaps fire, brilliance, daytime, the bright fortnight and the six month course fo the northern sun refers to the mystic insights into one pole of the ambivalence of maya. The opposite pole of the dark path might refer to the insights of the occults, or tantric, 'wisdom' -- the dark side of ambivalence which ensures not salvation (moksha) but re-birth.