Sanctify them through Thy truth: Thy word is truth. – John 17:17

Holy Scripture is the standard of truth. To the law and to the testimony; if they speak not according to this word, it is because there is no truth in them. “Thy word is truth.” Here is silver tried in the furnace and purified seven times. Speak of Infallibility? It is not at Rome, but it is here in this Book. Here is an infallible witness to the truth of God, and he that is taught of the Holy Spirit to understand it gets at the truth. Now, dear brethren, do aim to get the right truth, the real truth, as to matters of doctrine. Count it not a trifle to be sound in the faith. Think no error to be harmless, for truth is very precious, and error, even when we do not see it to be so, may lead to the most solemn consequences of mischief. In this world we see too much of salvation without Christ-I mean we meet with many who believe that they are saved because they have been baptized, or confirmed, or passed through the ceremonies of the church to which they belong. They have not looked to the precious blood; they are not depending simply upon the finished work of the Redeemer, but something else than Christ has become their confidence. Now, avoid that, and buy the truth, which lies here, “Believe on the Lord Jesus Christ, and thou shalt be saved.”

Buy the truth in this matter. Stand to it that it is the work of the Holy Spirit in rational and intelligent beings, leading them to hate sin, and to lay hold of eternal life. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3449.cfm