Apollinaris renders as meaninglessly as possible: ὄμματα δενδροκόμων ὀρέων ὑπερεξετάνυσσα - with a reproduction of the misapprehended ἦρα of the lxx. The expression in fact is אשּׂא, and not נשׂאתי. And the mountains towards which the psalmist raises his eyes are not any mountains whatsoever. In Ezekiel the designation of his native land from the standpoint of the Mesopotamian plain is "the mountains of Israel." His longing gaze is directed towards the district of these mountains, they are his ḳibla, i.e., the sight-point of his prayer, as of Daniel's, Daniel 6:11. To render "from which my help cometh" (Luther) is inadmissible. מאין is an interrogative even in Joshua 2:4, where the question is an indirect one. The poet looks up to the mountains, the mountains of his native land, the holy mountains (Psalm 133:3; Psalm 137:1; Psalm 125:2), when he longingly asks: whence will my help come? and to this question his longing desire itself returns the answer, that his help comes from no other quarter than from Jahve, the Maker of heaven and earth, from His who sits enthroned behind and upon these mountains, whose helpful power reaches to the remotest ends and corners of His creation, and with (עם) whom is help, i.e., both the willingness and the power to help, so that therefore help comes from nowhere but from (מן) Him alone. In Psalm 121:1 the poet has propounded a question, and in Psalm 121:2 replies to this question himself. In Psalm 121:3 and further the answering one goes on speaking to the questioner. The poet is himself become objective, and his Ego, calm in God, promises him comfort, by unfolding to him the joyful prospects contained in that hope in Jahve. The subjective אל expresses a negative in both cases with an emotional rejection of that which is absolutely impossible. The poet says to himself: He will, indeed, surely not abandon thy foot to the tottering (למּוט, as in Psalm 66:9, cf. Psalm 55:23), thy Keeper will surely not slumber; and then confirms the assertion that this shall not come to pass by heightening the expression in accordance with the step-like character of the Psalm: Behold the Keeper of Israel slumbereth not and sleepeth not, i.e., He does not fall into slumber from weariness, and His life is not an alternate waking and sleeping. The eyes of His providence are ever open over Israel.

Psalm 121:8 Parallel Commentaries

thy going out

Deuteronomy 28:6,19 Blessed shall you be when you come in, and blessed shall you be when you go out...

2 Samuel 5:2 Also in time past, when Saul was king over us, you were he that led out and brought in Israel: and the LORD said to you...

Ezra 8:21,31 Then I proclaimed a fast there, at the river of Ahava, that we might afflict ourselves before our God...

Proverbs 2:8 He keeps the paths of judgment, and preserves the way of his saints.

Proverbs 3:6 In all your ways acknowledge him, and he shall direct your paths.

James 4:13-16 Go to now, you that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain...

from this time

Psalm 113:2 Blessed be the name of the LORD from this time forth and for ever more.

Psalm 115:18 But we will bless the LORD from this time forth and for ever more. Praise the LORD.