So then faith cometh by hearing, and hearing by the word of God. – Romans 10:17

The Word, we say, is the only sword which the Spirit uses. I know the Holy Ghost uses gracious sermons; but it is only in proportion as they have the Word of God in them. Conviction, conversion, and consolation still are wrought, and only by the Word of God. Learn, then, the wisdom of using the Word of God for holy purposes. All wisdom dwells in Him. He thought out the laws which govern nature and direct providence. The Holy Spirit is the great teacher of human spirits: He taught Bezaleel and the artificers in the wilderness how to make the fine linen, and the gold and carved work for the tabernacle. All arts and sciences are perfectly known to Him, and infinitely more than men can ever discover. Yet He will not use these things in this holy controversy. In the quarrel of His covenant He neither uses philosophy, nor science, nor rhetoric. In contending against the powers of darkness, “The sword of the Spirit is the Word of God.” “It is written” is His master-stroke. Words which God has spoken by holy men of old, and has caused to be recorded on the sacred page-these are the battle-axe and weapons of war of His Spirit. This Book contains the Word of God, and is the Word of God; and this it is which the Holy Ghost judges to be so effectual a weapon against evil that He uses this, and this only, as His sword in the great conflict with the powers of darkness. ~ C.H. Spurgeon

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