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 of recognition, but it will all come back to us in some form as naturally, as perfectly, as inevitably, as echo answers to sound. Perhaps not as we expect it, how we expect it, nor where, but sometime, somehow, somewhere, it comes back, as the dove that Noah sent from the Ark returned with its green leaf of revelation. Let us conceive of gratitude in its largest, most beautiful sense, that if we receive any kindness we are debtor, not merely to one man, but to the whole world. As we are each day indebted to thousands for the comforts, joys, consolations, and blessings of life, let us realize that it is only by kindness to all that we can begin to repay the debt to one, begin to make gratitude the atmosphere of all our living and a constant expression in outward acts, rather than in mere thoughts. Let us see the awful cowardice and the injustice of ingratitude, not to take it too seriously in others, not to condemn it too severely, but merely to banish it forever from our own lives, and to make every hour of our living the radiation of the sweetness of gratitude. People who Live in Air Castles People who Live in Air Castles Living in an air-castle is about as profitable as owning a half-interest in a rainbow. It is no more nourishing than a dinner of twelve courses—eaten in a dream. Air-castles are built of golden moments of time, and their only value is in the raw material thus rendered valueless. The atmosphere of air-castles is heavy and stupefying with the incense of vague hopes and phantom ideals. In them man lulls himself into dreaming inactivity with the songs of the mighty deeds he is going to do, the great influence he some day will have, the vast wealth that will be his, sometime, somehow, somewhere, in the rosy, sunlit days of the future. The architectural error about air-castles is that the owner builds them _downward_ from their gilded turrets in the clouds, instead of _upward_ from a solid, firm foundation of purpose and energy. This diet of mental lotus-leaves is a mental narcotic, not a stimulant.