Nothing done in matter is immortal, for matter is perishable. The noblest monument of earthly builder will crumble; but he who works on the unseen, the spiritual, leaves impressions that shall endure for ever. The touch of beauty you put upon a life yesterday by the earnest words you spoke, by the new impulse you started in the heart of your friend, by the vision of heavenly purity you gave in your own life to one who was with you, will be bright when suns and stars shall have burned out to blackness. What we do on immortal lives is immortal. He is wise, therefore, who chooses to do his life's work on materials that shall never perish. Thousands of years hence he will find the things he has done enduring still in immortal beauty.