Let the words of my mouth - The words that I speak; all the words that I speak.
And the meditation of my heart - The thoughts of my heart.
Be acceptable in thy sight - Be such as thou wilt approve; or, be such as will be pleasing to thee; such as will give thee delight or satisfaction; such as will be agreeable to thee. Compare Proverbs 14:35; Isaiah 56:7; Isaiah 60:7; Jeremiah 6:20; Exodus 28:38; Leviticus 22:20-21; Leviticus 19:5. This supposes:
(a) that God has such control over our thoughts and words, that he can cause us to order them aright;
(b) that it is proper to pray to him to exert such an influence on our minds that our words and thoughts may be right and pure;
(c) that it is one of the sincere desires and wishes of true piety that the thoughts and words may be acceptable or pleasing to God.
The great purpose of the truly pious is, not to please themselves, or to please their fellow-men, (compare Galatians 1:10), but to please God. The great object is to secure acceptance with him; to have such thoughts, and to utter such words, that He can look upon them with approbation.
O Lord my strength - Margin, as in Hebrew, rock. Compare the note at Psalms 18:2.
And my redeemer - On the word used here, see the note at Job 19:25; compare Isaiah 41:14; Isaiah 43:14; Isaiah 44:6, Isaiah 44:24; Isaiah 47:4; Isaiah 63:16. The two things which the psalmist here refers to in regard to God, as the appellations dear to his heart, are
(a) that God is his Rock, or strength; that is, that he was his defense and refuge; and
(b) that he had rescued or redeemed him from sin; or that he looked to him as alone able to redeem him from sin and death.
It is not necessary to inquire here how far the psalmist was acquainted with the plan of salvation as it would be ultimately disclosed through the great Redeemer of mankind; it is sufficient to know that he had an idea of redemption, and that he looked to God as his Redeemer, and believed that he could rescue him from sin. The psalm, therefore, which begins with a contemplation of God in his works, appropriately closes with a contemplation of God in redemption; or brings before us the great thought that it is not by the knowledge of God as we can gain it from his works of creation that we are to be saved, but that the most endearing character in which he can be manifested to us is in the work of redemption, and that wherever we begin in our contemplation of God, it becomes us to end in the contemplation of his character as our Redeemer.