How do we know the work of the Holy Spirit is essential for sanctification?

Sanctification cannot occur apart from the action of the Holy Spirit, who is described in scripture as the one who transforms and purifies the believer. Ezekiel 36:26-27 highlights the Spirit's role in exchanging a 'stony heart' for a 'new heart', emphasizing that true holiness comes from God. Furthermore, 1 Corinthians 1:2 notes that believers are sanctified 'in Christ Jesus' and by the Spirit, reiterating the Spirit’s specific function in the ongoing work of sanctification. Thus, understanding this truth is vital for the believer's growth.