God is the trainer.
Titus 2v11-14
For the grace of God has appeared, bringing salvation for all people, training us to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives in the present age, waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ, who gave himself for us to redeem us from all lawlessness and to purify for himself a people for his own possession who are zealous for good works.
It is by the power of God that we are trained into righteousness and purity. Sometimes we tend to put it all on ourselves to be the image of Christ and when we fail we fall hard. But we must trust in God, His Spirit inside us and believe in His power, mercy, and grace to make us like Him; after all it is all for His glory so we should be confident in coming to Him to strengthen us when we are weak. PTL for His son and just the opportunity to be considered His when we don’t deserve it.