The instrument of our sanctification is the Word of God. The Spirit of God brings to our minds the precepts and doctrines of truth, and applies them with power. The truth is our sanctifier. If we do not hear or read it, we will not grow in sanctification.
Apostle Paul writes in Romans 1:16: “For I am not ashamed of the gospel; it is the power of God for salvation to everyone who has faith, to the Jew first and also to the Greek.