Sin is a part of every person's life, to varying degrees. Many think that it is just part of life and does not impact us at all. Sin is extremely damaging to our psyche. The more we give in, the more our sensitivity to it diminishes greatly, making the next sin even easier to give into. Satan knows this and tempts that us with small things at first and then pushes towards worse and worse things. Repentance is the only thing that can lead us back to God and the plan he has for our lives.