As a force-producer, man's primary influence is voluntary in nature. This is the capacity of purposely bringing all the soul's powers to bear upon society. It is the foundation of all instruction. The parent influences the child this way or that. The artist-master plies his pupil. The brave general or discoverer inspires and stimulates his men by multiform motives. The charioteer holds the reins, guides his steeds, restrains or lifts the scourge. Similarly man holds the reins of influence over man, and is himself in turn guided. So friend shapes and molds friend. This is what gives its meaning to conversation, oratory, journalism, reforms. Each man stands at the center of a great network of voluntary influence for good. Through words, bearing and gesture, he sends out his energies. Oftentimes a single speech has effected great reforms. Oft one man's act has deflected the stream of the centuries. Full oft a single word has been like a switch that turns a train from the route running toward the frozen North, to a track leading into the tropic South. Not seldom has a youth been turned from the way of integrity by the influence of a single friend. Endowed as man is, the weight of his being effects the most astonishing results. Witness Stratton's conversation with the drunken bookbinder whom we know as John B. Gough, the apostle of temperance. Witness Moffat's words that changed David Livingstone, the weaver, into David Livingstone, the savior of Africa. Witness Garibaldi's words fashioning the Italian mob into the conquering army. Witness Garrison and Beecher and Phillips and John Bright. Rivers, winds, forces of fire and steam are impotent compared to those energies of mind and heart, that make men equal to transforming whole communities and even nations. Who can estimate the soul's conscious power? Who can measure the light and heat of last summer? Who can gather up the rays of the stars? Who can bring together the odors of last year's orchards? There are no mathematics for computing the influence of man's voluntary thought, affection and aspiration upon his fellows.