The Psalmist is declaring in this Psalm that God creates reality according to His goodness and is proved by His absolute defense of us. At this place he employs the sun and the moon as metaphors for the size of the opposition and the time it accepts God to defend us against all potential troubles. He uses this word "lift" as a metaphor for Gods representative on the earth which pronounces Gods Law, covenants, decrees and promises in being the object of Gods absolute defense. You see this term repeated throughout the Psalms like lift up my soul, hands, head, cup, and horns, etc. All of these phrases are metaphors, showing we have the ability to create this kingdom defense by using His spoken word in the context of His anthropomorphism to establish His power. He is lifting up His eyes in the sense that He is as secure as God is sovereign. The Psalmist is also declaring God protects Israel from all troubles. This term "slip" is describing the inevitable end that comes upon the wicked whos life is like being on a slippery object and sliding down into hell. When He pronounces God as maker of Heaven and earth its in the context of God speaking everything into reality from eternity past. The Psalmist uses Gods covenant, laws etc as the creative defense that are on his lips in warring against the nations. So the Psalmist is not saying he gets these benefits in using the means of faith. Im talking about in our culture going to church, observing days, etc. He is talking about using Gods spoken word in a prudent way. And in this sense he not purely is a warrior but a prophet and a king. Since I moved to the mountains, I gain a more thorough understanding of what the Psalmist is talking about here. You bear this comparison to the sun and the moon and the incredible size of the mountains to block out this light that shines beyond the earth. We see our trials are defined by God according to His understanding of eternity, His presence in which He has viewed all events on the earth from His eternal position. He acquires the wisdom of Someone who has been present from the beginning of time. When we explore the mountains, there are places where the sun has been blocked out to the point where it is dark. Hence, you retain the massive presence of the light that shines from the sun, and it is blocked out by an exclusive cliff. In this sense it is slighter than a pebble from Gods view. So the Psalmist never indeed describes grace unless it includes this context where God lowers Himself so that we cannot slip. In fact the Psalmist describes Gods incarnation as going under our deepest trial and upholding us with His hand.