How do we know sanctification is a work of God?

The foundation of sanctification lies in the understanding that it is not the result of human action but rather a sovereign work of God. As seen in John 17:19, Jesus states, 'And for their sakes, I sanctify myself, that they also may be sanctified through the truth.' This highlights the truth that believers are sanctified through their identification with Christ and His redemptive work. It is God who regenerates and transforms the hearts of sinners, granting them the faith and repentance necessary to receive salvation. Recognizing that sanctification stems from divine grace helps believers understand their identity as children of God, set apart for His glory.