The goal of the Christian life is to become like Jesus. When we choose to follow Jesus, we choose to leave behind our selfish habits and desires. God gives us the Holy Spirit to continually convict us of things that do not reflect His character. God chips away everything in us that does not look like Jesus!
This life cleansing process is known as sanctification or holiness, in which God continually makes us more like Jesus.
Repentance is the act of turning away from the pursuit of sin and pursuing Christlikeness instead. Though we do not fully become like Jesus Christ until we reach heaven, we can take a step closer each day through repentance and surrender.