When one repents, this means to do an about face from walking in sin. This is not just saying a prayer, but actually doing something about it and choosing a separated life in Christ. We all have a weakness, but Christ can strengthen us and teach us. Romans 2:1-4

The evidence of repentance is the fact that sin is no longer something we indulge in. I often am tempted by sin, but I hate the sin I used to love. I have turned from sin.