To heal sick bodies is good, but to heal the soul is better. When your heart is full of love and compassion, you are sending out from your own center the light which God has implanted in you as a tiny seed. As you aspire to the Great White Spirit, God, so this light and power grows in you.
Every thought of God, every small effort that you make to think rightly, to reach up to a higher level of truth, goodness, purity, and love, is a help to heal the world. This manifestation of sunlight through you, the quiet infiltration of this holy light into human hearts and lives, will indeed heal the whole world.