And take the helmet of salvation, and the sword of the Spirit, which is the word of God; – Ephesians 6:17

It is the lot of some of us to be called to withstand great errors. We have been sorely harassed at times with doubts and misgivings about some established truth. I suppose no one is a firm believer who has not once been a doubter. He knows no faith who never had a fear; for candid enquiry must go before absolute credence. How can anyone know the proofs and vouchers of his faith unless he has taken pains to dig into the volume of evidence that lies at its base? Now it is a fine, a noble thing, when you have had a conflict in your own soul with some plausible heresy, some seductive perversion of the truth, and have put it to flight with the sword of the Spirit, which is the word of God; it is a noble feat, I say, to capture the arms of your assailant and to use the very weapons of the adversary against him. You have detected his sophistry, you have found out his devices, and now for the future you will not be so readily carried away with every wind of doctrine. This time you are too old to be taken with his chaff. You were deceived once, but by God’s grace you are not willing any longer to lend a ready ear to the fair speech which casts a mist over plain facts, but you henceforth resolve to prove the spirits whether they be of God. Texts of Scripture are sometimes used by the adversaries of the gospel and turned against us. I know some ministers who, when they meet with a passage that they cannot immediately reconcile with the orthodox faith, alter the reading, or put a fresh sense on the words, or twist it and turn it to suit their purpose. It is a bad plan, my brethren; the texts of Scripture are to be taken as they stand, and you may rest assured they will always defend, never overturn, the faith once delivered to the saints. ~ C.H. Spurgeon

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