Hakaras Hatov (gratitude) is the root of all of our good middos (traits). The way we see others is merely a reflection of how we see ourself. How can I attach myself more to this quality of tov (good)? When Moshiach arrives he will enable us to see the goodness in everyone that was always there. Reb Zusha was the epitome of gratitude and happiness. If we want everything, then we'll attain nothing. But if we want nothing, then we'll have everything. Saying good and thinking good to another Jew brings the light of teshuvah (repentance) into the world. What can I do to erase ra (evil)? By doing good- by loving another Jew.