And the priest said, The sword of Goliath the Philistine, whom thou slewest in the valley of Elah, behold, it is here wrapped in a cloth behind the ephod… – 1 Samuel 21:9

Did you ever have a personal, mental, moral conflict with some great dragon of besetting sin? If so be you have been enabled to smite it valiantly, and slay it utterly, I know you have gained trophies to hang in the house of God. To do so will be of no small advantage to ourselves, because you can take them down and use them in the future; and you will find they are footholds of your strength to fight with the next sin that comes upon you. The strength which God has educated and fostered in the last struggle will greatly assist you in the next. The man who gives way to one sin will very readily give way to another, but a man who through God’s grace has won a very high vantage ground by mastering one sin, will be very likely to win another. The spoils taken from the last Philistine will help us to go forth and win more, and in the name of God we shall get the victory. Perhaps there has been some other vice which he has cherished in secret and clung to with the more tenacity because it is so tenacious! Of that evil he has purged himself, and from that bondage he has escaped. Is it not possible that there yet remains one transgression which lurks in the breast of such a one? Very likely at this time he has a passionate temper. Down with it, my brother. You slew the lion, and you slew the bear, and this uncircumcised Philistine shall be as one of them. Do not be afraid to grapple with it. Do not say, “I have a quick temper, and I cannot help it.” There is no need for it. God’s grace can drive it out even as the rest. Beard it in the name of the Most High and use the trophies that you stole from past success-nay, fairly won them from the foes you have vanquished-use those with which to combat sins that now assail you. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0972.cfm