Charles H. Spurgeon on Psalms 125:1

Whole Psalm. In the degrees of Christian virtue, this psalm represents the sixth step —the confidence which the Christian places in the Lord. "It teacheth us, while we ascend and raise our minds unto the Lord our God in loving charity and piety, not to fix our gaze upon men who are prosperous in the world with a false happiness." (Augustine.) —H. T. Armfield, in "The Gradual Psalms," 1874.

Whole Psalm. This short psalm may be summed up in those words of the prophet (Isa 3:10-11), "Say ye to the righteous, that it shall be well with him. Woe unto the wicked! it shall be ill with him." Thus are life and death, the blessing and the curse, set before us often in the psalms, as well as in the law and in the prophets. —Matthew Henry, 1662-1714.

They that trust in the LORD. Note how he commandeth no work here to be done, but only speaketh of trust, In popery in the time of trouble men were taught to enter into some kind of religion, to fast, to go on pilgrimage, and to do such other foolish works of devotion, which they devised as an high service unto God, and, thereby thought to make condign satisfaction for sin and to merit eternal life. But here the Psalmist leadeth us the plain way unto God, pronouncing this to be the chiefest anchor of our salvation, —only to hope and trust in the Lord; and declaring that the greatest service that we can do unto God is to trust him. For this is the nature of God —to create all things of nothing. Therefore he createth and bringeth forth in death, life; in darkness, light. Now to believe this is the essential nature and most special property of faith. When God then seeth such a one as agreeth with his own nature, that is, which believeth to find in danger help, in poverty riches, in sin righteousness, and that for God's own mercy's sake in Christ alone, him can God neither hate nor forsake. —Martin Luther (1483-1546), in "A Commentary on the Psalms of Degrees."