Also for our reflection and meditation on Psalm 121 today we include these comments of John Calvin on v.8 as he teaches us what it means that God is our sovereign Keeper. May his words too stir us up to confident trust in Him and to reverent worship of Him.
8. Jehovah will keep thy going out and thy coming in.
The sense is, Whatever thou shalt undertake or engage in during thy life shall come to a happy and successful termination. God no doubt directs by his Holy Spirit the, deliberations of his servants; but it appears to me, that this passage is rather to be referred to prosperous issues. If, however, any one would give it a more extended meaning I have no objection. It is enough for me to embrace that sense which is indisputably certain and solid, That God will be the continual guide of his people, so that stretching out his hand to them he will conduct them according to their hearts’ desire from the beginning even to the end.
Farther, it is of importance to mark the reason why the Prophet repeats so often what he had briefly and in one word expressed with sufficient plainness. Such repetition seems at first sight superfluous; but when we consider how difficult it is to correct our distrust, it will be easily perceived that he does not improperly dwell upon the commendation of the divine providence. How few are to be found who yield to God the honor of being a keeper, in order to their being thence assured of their safety, and led to call upon him in the midst of their perils! On the contrary, even when we seem to have largely experienced what this protection of God implies, we yet instantly tremble at the noise of a leaf falling from a tree, as if God had quite forgotten us.
Being then entangled in so many unholy misgivings, and so much inclined to distrust, we are taught from the passage that if a sentence couched in a few words does not suffice us, we should gather together whatever may be found throughout the whole Scriptures concerning the providence of God, until this doctrine-” That God always keeps watch for us” — is deeply rooted in our hearts; so that depending upon his guardianship alone we may bid adieu to all the vain confidences of the world.
The Three R's Blog 
Every saint is indwelt by the Holy Spirit and therefore able to desire godliness. Yet sin afflicts us and we are too easily led astray. So each Christian must strive for godliness and seek to walk in a manner pleasing unto God – His Spirit wills us to that which is good. Let the saints praise Him for is the faithful witness and only being Who keeps His promises!
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