Ps. 95.3 (the great-god-king)

For Yhwh / is the Great God
the Great King / over all the gods. 

This verse is a type of liturgy-to-the-First-Commandment. In other words, the opening verses served as a call to liturgy, to ‘approaching-Yhwh’ in his Temple. They were verse full of the prodigal and festive joy of Yhwh’s people as travelled (literally) closer and closer to him. Here, that ‘joy’ is rooted, or flows from, this primal declaration about Yhwh’s supremacy over all gods. Here, the divine glory that is manifest in ‘other gods’ is (incredibly) surpassed by Yhwh, who ‘reigns’ as the Great-God-King over them all. Here, the command ‘that you shall have no other god beside(s) me,’ is, rather, an acclamation, a shout, a celebration and a song. This is the ‘command written on the heart’, so to speak; when the ‘command becomes liturgy’ (or, honey; Psalm 119 is a perfect expression of Torah-to-liturgy). 

This ‘competitive’ or ‘jealous’ focus on Yhwh is key to understanding in this psalm, as it is likely that it is the ‘other gods’ that threaten to remove the people from the ‘today’ that is open to them and place them in the ‘that day’ that their fathers inhabited. However, the nature of this ‘competiveness’ and ‘jealousy’ is different than we might otherwise think. It is not the case that there is a limited amount of divine glory, and that Yhwh simply ‘has the most’. The following verses will make clear that creation, from the depths to the height, and mankind, are Yhwh’s. ‘Creation’ here embraces the divine realm, as well as the physical order; the ‘mountain tops’ are typically places of divine habitation; Yhwh does not compete for these—he made them. As such, Yhwh does not govern merely a portion of creation (as he would if divine glory were ‘apportioned’). Rather, Yhwh’s Great-Kingship is established by his being the source of creation and divine authority (not being a ‘participant’ within it, as the other gods would). As such, what we see is that Yhwh does have to compete for his people’s hearts, but he does not have to compete with the other gods as if he were but a ‘god among gods’. And, it is precisely this reality that the psalmist and the people are exemplifying—unlike their fathers, who turned from Yhwh and believed his presence/power to be limited, their hearts are attuned to Yhwh’s ‘Great-Kingship’. They have ‘consumed’ the First Commandment, and now live-it-in-liturgy. As such, they live in the ‘today’ that is, in fact, the only day there is.