Is Sanctification God's Responsibility or Ours?

As I began to think about the idea of sanctification, I realized I had never really heard someone define it. I had heard my preacher talk about sanctification, but I couldn't really pinpoint exactly what it meant. Therefore, I would like to begin by giving a definition of sanctification.

Sanctification is being set apart as a holy and sacred person of God in the name of Jesus Christ. When we are sanctified, it as if we are washed clean of our old self and made into a new creature.
I believe that the Holy Spirit and the Word of God are responsible for our sanctification.

The Bible is clear that the Holy Spirit is responsible for our sanctification. Romans 15:16 says,

"And that is what some of you were. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God"
(NIV). (emphasis added)

Titus 3:5 says,

"he saved us, not because of righteous things we had done, but because of his mercy. He saved us through the washing of rebirth and renewal by the Holy Spirit" (NIV). (emphasis added)

The Bible also makes reference to the fact that we are sanctified by the Word of God. John 17:17 says,

"Sanctify them by the truth; your word is truth" (NIV).

Having said all this, I do believe that we cannot be truly sanctified if we do not take part in the process. God calls us to examine ourselves and get rid of all that is not of Him.

2 Corinthians 7:1 says,

"Since we have these promises, dear friends, let us purify ourselves from everything that contaminates body and spirit, perfecting holiness out of reverence for God" (NIV).

It is only when we join with the Holy Spirit and the Word of God that we can experience complete sanctification.