When people are merry and dance, it sometimes happens that they catch hold of someone who is sitting outside and grieving, pull him into the round, and make him rejoice with them. The same happens in the heart of one who rejoices; grief and sorrow draw away from him, but it is special virtue to pursue them with courage and to draw grief into gladness, so that all the strength of sorrow may be transformed into joy.
— Hasidic Teaching , The Courage to Laugh by Allen Klein