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O Lord my rock - צורי tsuri not only means my rock, but my fountain, and the origin of all the good I possess.

If thou be silent - If thou do not answer in such a way as to leave no doubt that thou hast heard me, I shall be as a dead man. It is a modern refinement in theology which teaches that no man can know when God hears and answers his prayers, but by an induction of particulars, and by an inference from his promises. And, on this ground, how can any man fairly presume that he is heard or answered at all? May not his inductions be no other than the common occurrences of providence? And may not providence be no more than the necessary occurrence of events? And is it not possible, on this skeptic ground, that there is no God to hear or answer? True religion knows nothing of these abominations; it teaches its votaries to pray to God, to expect an answer from him, and to look for the Holy Spirit to bear witness with their spirits that they are the sons and daughters of God.

Unto thee will I cry - That is, under the consciousness of the danger to which I am exposed - the danger of being drawn away into the society of the wicked. In such circumstances his reliance was not on his own strength; or on his own resolutions; on his own heart; or on his fellowmen. He felt that he was safe only in God, and he appeals to Him, therefore, in this earnest manner, to save him.

O Lord my rock - See the notes at Psalm 18:2.

Be not silent to me - Margin, “from me.” So the Hebrew. The idea is that of one who will not speak to us, or who will not attend to us. We pray, and we look for an “answer” to our prayers, or, as it were, we expect God to “speak” to us; to utter words of kindness; to assure us of His favor; to declare our sins forgiven.

Lest, if thou be silent to me - If thou dost not answer my supplications.

I become like unto them that go down into the pit - Like those who die; or, lest I be crushed by anxiety and distress, and die. The word “pit” here refers to the grave. So it is used in Psalm 30:3; Psalm 88:4; Isaiah 38:18; Isaiah 14:15, Isaiah 14:19. The meaning is, that if he did not obtain help from God he despaired of life. His troubles would overwhelm and crush him. He could not bear up under them.

David is very earnest in prayer. Observe his faith in prayer; God is my rock, on whom I build my hope. Believers should not rest till they have received some token that their prayers are heard. He prays that he may not be numbered with the wicked. Save me from being entangled in the snares they have laid for me. Save me from being infected with their sins, and from doing as they do. Lord, never leave me to use such arts of deceit and treachery for my safety, as they use for my ruin. Believers dread the way of sinners; the best are sensible of the danger they are in of being drawn aside: we should all pray earnestly to God for his grace to keep us. Those who are careful not to partake with sinners in their sins, have reason to hope that they shall not receive their plagues. He speaks of the just judgments of the Lord on the workers of iniquity, ver. 4. This is not the language of passion or revenge. It is a prophecy that there will certainly come a day, when God will punish every man who persists in his evil deeds. Sinners shall be reckoned with, not only for the mischief they have done, but for the mischief they designed, and did what they could to effect. Disregard of the works of the Lord, is the cause of the sin of sinners, and becomes the cause of their ruin.