Proverbs 14:13 Laughter can conceal a heavy heart, but when the laughter ends, the grief remains.
Our bodies, our souls, was made to serve the Lord, to do what is right, to love one another. Our bodies grieve when we don't do what we were made to do. We can go about acting happy... doing things that we think will make us happy. We can try our best to hide our sadness...but when we go home at night and climb into bed we will feel that grief. Shopping, partying, playing those things will not get rid of the sadness we feel when we are not doing what we were created to do. Only loving God, loving our neighbors, doing the things God ask us to do will get rid of the grief. Our souls were made for love and serving the God... for serving other. To have a happy soul we need to love God with all our hearts, and love our neighbor as ourselves (Matthew 22:37).