People often think, "If I just have enough will power, I can change."
In some circumstances, this is true. We can change how we eat, how we react to difficult situations, our tempers. However, we can't change our insides.
On Sunday, my pastor likened people trying to become better to trying to clean the dirt off your clothes with a muddy hand. It doesn't work.
When our sinful selves attempt to clean our insides, we can't do it. You have to start out with perfection to be able to clean something dirty. Jesus' perfection is the only way to get rid of our sin.