Sanctification includes both the Cross and the Holy Spirit.
1. Paul said (and this should be true for all Christians): I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me. (Gal 2:20) This means that the power of sin, the power of the flesh, or the old sinful Adamic nature, was destroyed at the cross, and therefore sin shall NOT have dominion over you.
2. At the same time, it is by the power of the Holy Spirit within that Christians can live a victorious life in Christ: For it is God which worketh in you both to will and to do of his good pleasure. (Phil 2:13)
Christians should not be focused on, or practising, sinful thoughts and deeds. Their focus must be on doing God's will. It is that simple.