We can't be confident on ourselves but Christian's confidence is in Christ.
Kahit na wala tayong makitang mabuti sa sarili natin, alalahanin lang na Siya na ang nabubuhay sa 'tin.
I have been crucified with Christ and I no longer live, but Christ lives in me. The life I now live in the body, I live by faith in the Son of God, who loved me and gave himself for me.
Galatians 2:20