Joy 

שמחה

The joy one brings to others provides an especially significant merit. 

Rabbi Beroka of Hoza’a was often found in the marketplace of Bei Lefet, and Elijah the prophet would frequently appear to him there. Once Rabbi Beroka said to Elijah: Of all the people who come here, is there anyone in this marketplace worthy of the World to Come? Elijah said to him: No…. 

Meanwhile, two others came to the marketplace. Elijah said to Rabbi Beroka: These two…are destined for the World to Come. Rabbi Beroka went over to the men and said to them: What is your occupation? They told him: We are jesters, and we cheer up the depressed. Also, when we see two people who have a quarrel, we strive to make peace between them.  <source>(<i>Ta'anit</i> 22a) </source>