18 The whole contents of the Psalm, then, are a prayer that she may be heard, from the words, “hear my words, O Lord,” unto, “my King, and my God.” Then follows a view of those things which hinder the sight of God, that is, a knowledge that she is heard, from the words, “because I shall pray unto You, O Lord, in the morning You will hear my voice,” unto, “the man of blood and the crafty man the Lord will abominate.” Thirdly, she hopes that she, who is to be the house of God, even now begins to draw near to Him in fear, before that perfection which casts out fear, from the words, “but I in the multitude of Your mercy,” unto, “I will worship at Your holy temple in Your fear.”
Fourthly, as she is progressing and advancing among those very things which she feels to hinder her, she prays that she may be assisted within, where no man sees, lest she be turned aside by evil tongues, for the words, “O Lord, lead me forth in Your justice because of my enemies,” unto, “with their tongues they dealt craftily.” Fifthly, is a prophecy of what punishment awaits the ungodly, when the just man shall scarcely be saved; and of what reward the just shall obtain, who, when they were called, came, and bore all things manfully, till they were brought to the end, from the words, “judge them, O God,” unto the end of the Psalm.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)