He shows us through the law what sin is and where it is, so we can try to avoid it. We can all get so deep into our comfort zones that we lose a lot of what we have learned. We should always be striving to grow. Comfort zones for very short while are OK, but for long periods can cause destruction. For if God loved us so much that He gave His own Son, then how much is it for us to be sure we are always in that type of sacrificial love.
True growth comes from purging oneself from all forms of negative thought and energy.
First spend time with God, listening to Him. At first this may take a while to do, but is the most important thing you can do. It is not getting out witnessing to others that is important. Too many people do this wrongly and end up messing up something God is already working on. He alone should instruct us in what to say.