Start here at the Introduction: The Journey Begins
The Journey: Part 9 - The Babes of Corinth and the Children of Galatia
What is sanctification? It is the life-long progressive growth of your knowledge of the written Word of God and the subsequent and inevitable changes that this knowledge brings to your life after salvation. Most believers, however, stop right there at salvation. After the initial revelation of justification through the cross of Christ, there is not much growth after this. They never push on to studying the Word and seeking the deeper things of God. It always reminds me of the parable of the Sower in Matthew 13.