Ad Dominum. A prayer in tribulation. A gradual canticle. The following psalms, in number fifteen, are called gradual psalms, or canticles, from the word gradus, signifying steps, ascensions, or degrees: either because they were appointed to be sung on the fifteen steps, by which the people ascended to the temple: or, that in the singing of them the voice was to be raised by certain steps or ascensions: or, that they were to be sung by the people returning from their captivity and ascending to Jerusalem, which was seated amongst mountains. The holy fathers, in a mystical sense, understand these steps, or ascensions, of the degrees by which Christians spiritually ascend to virtue and perfection; and to the true temple of God in the heavenly Jerusalem.

[1] In my trouble I cried to the Lord: and he heard me. [2] O Lord, deliver my soul from wicked lips, and a deceitful tongue. [3] What shall be given to thee, or what shall be added to thee, to a deceitful tongue? [4] The sharp arrows of the mighty, with coals that lay waste. [5] Woe is me, that my sojourning is prolonged! I have dwelt with the inhabitants of cedar:

[6] My soul hath been long a sojourner. [7] With them that hated peace I was peaceable: when I spoke to them they fought against me without cause.