On the left you see a common person, who has lived in sin for a few years. At the Start, which we call the New birth, God gives us a New nature. This has a portion of Christ's own conquering Spirit.
Through this we receive both the Motivation and the Power to resist and overcome the evil. Jesus himself explained this mystery with the expression that he had to die "like a grain of Wheat", in order for God to multiply His conquering Spirit within us.