For the word of God is quick, and powerful, and sharper than any two-edged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart. – Hebrews 4:12

We have seen this sword take off the head of many a Goliath doubt, and slay a horde of cares and unbeliefs. We have seen the Spirit pile up heaps upon heaps of the slain when the Word of conviction has gone forth, and men have seen sin to be sin, and fallen down as dead before the Lord and His law. We also know what the use of the sword by the Spirit of God means, for within our own being He has left marks of His prowess. He has killed our doubts and fears, and left no more mistrusts to worry us. There was a man of God who was frequently subject to doubts, even doubts upon the fundamentals of religion. He hated this state of mind; but still he could not get rid of the habit of evil questioning. In answer to prayer, the Spirit came, and convinced him of the pride of his intellect, and of the wickedness of setting up his judgment against the Word of the Lord; and from that day forward he was never the subject of another fit of unbelief. He saw things clearly in the light of the Holy Spirit; and that is to see them indeed. The great giant of doubt is sorely wounded by the sword of the Spirit- yea, he is slain outright; for the Spirit works in the believer such a conviction of the truth that assurance banishes suspicion. When the Holy Spirit deals with the lusts of the flesh, and the lusts of the eye and the pride of life, these also lie at His feet, trophies to the power of His mighty weapon, even the Word of God! The Holy Spirit is glorious in the use of this sword. He finds that this weapon suits His hand, and He seeks no other. Let us use it also, and be glad to do so. Though it is the sword of the Spirit, yet our feebler hand may grasp it; yea, and find in the grasping that somewhat of the divine power comes unto our arm. ~ C. H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2201.cfm