No good act performed in the world ever dies. Science tells us that no atom of matter can ever be destroyed, that no force once started ever ends; it merely passes through a multiplicity of ever-changing phases. Every good deed done to others is a great force that starts an unending pulsation through time and eternity. We may not know it, we may never hear a word of gratitude or recognition, but it will all come back to us in some form as naturally, as perfectly, as inevitably, . . . as echo answers to sound.