It’s the Holy Spirit that was promised to circumcise hearts of the beleivers all back from the the time of Moses (Deut 30:6, Jer 4:4, Ez 36:25-27, Joel 2:28-32, Acts 2:16-21, Rom 2:29, and Col 2:11) and give bleeivers the power to overcome sin nature so that we can accomplish the task of keeping God’s commands.