Charles H. Spurgeon on Psalms 141:9

Keep me from, the snares which they have laid for me. He had before asked, in Ps 141:3, that the door of his mouth might be kept; but his prayer now grows into "Keep me." He seems more in trouble about covert temptation than concerning open attacks. Brave men do not dread battle, but they hate secret plots. We cannot endure to be entrapped like unsuspecting animals; therefore we cry to the God of wisdom for protection. And the gins of the workers of iniquity. These evil workers sought to catch David in his speech or acts. This was in itself a piece of in equity, and so of a piece with the rest of their conduct. They were bad themselves, and they wished either to make him like themselves, or to cause him to seem so. If they could not catch the good man in one way, they would try another; snares and gins should be multiplied, for anyhow they were determined to work his ruin. Nobody could preserve David but the Omniscient and Omnipotent One: he also will preserve us. It is hard to keep out of snares which you cannot see, and to escape gins which you cannot discover. Well might the much hunted Psalmist cry, "Keep me."