I was also upright before Him, and I kept myself from mine iniquity. – Psalm 18:23

This is a dreadful possession to have in the house; a man had better have a cage of cobras than have an iniquity, yet we have each of us to deal at home with some special form of sin. It is said that there is a skeleton in every house. I do not know whether that is true; but I do know that there is something very much allied to a skeleton, that is, the body of this death with which we all have to deal; and it takes a special shape in each good man. There is some particular sin which he may call “mine iniquity.” Not only is there the general iniquity which affects the whole race, but each man has his own particular form of it: “All we like sheep have gone astray; we have turned every one to his own way.” There is a general sin, but there is a particularity in it, too; each man has his own way of sinning, so that he can speak of “mine iniquity.” Some are sanguine; they are expecting great things, and they fall into the sin of expecting to drink sweet waters from the cisterns of this world. There are some of quite another temperament, who are inclined to despondency, perhaps to suspicion; they may fall into mistrust, or various forms of unbelief, and even into despair, which will be very grievous to the God who is ever gracious. There are some men who, from their very parentage, are inclined to drunkenness or to unchastity. There are others, favoured by God with a godly ancestry who, if they were left to themselves, would not probably fall into either of these forms of sin, yet they might be proud of their own integrity, and proud of their own uprightness; and is not pride as great a sin as those more open transgressions? Depend on it, my dear friend, thou hast some tendency peculiar to thyself, and there is a special point where thou liest open to the attacks of temptation. Happy will that man be who so knows himself that he sets a double watch against that postern gate through which the adversary is apt to creep in the dark. Peculiar constitutions may lead to special forms of sin, and it behooves the godly man to keep himself from his own iniquity. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2432.cfm