Adam Clarke on Psalms 130:5

I wait for the Lord - The word קוה kavah, which we translate to wait, properly signifies the extension of a cord from one point to another. This is a fine metaphor: God is one point, the human heart is the other; and the extended cord between both is the earnest believing desire of the soul. This desire, strongly extended from the heart to God, in every mean of grace, and when there is none, is the active, energetic waiting which God requires, and which will be successful.