Jews believe that they must do the "mitzvot" with happiness and joy because the Bible says “Serve God with joy; come before God with singing” (Psalms 100:2). Doing a "mitzvah" helps a person come close to God and that makes the person happy. A group of Jews called the Hasidim say this is the best way to live. They say that worrying takes people away from joy and they will not see the beauty and good in the world.