I do not know what inventions are in the brain of the future; I do not know what garments of glory may be woven for the world in the loom of years to be; we are just on the edge of the great ocean of discovery. I do not know what is to be discovered; I do not know what science will do for us. I do know that science did just take a handful of sand and make the telescope, and with it read all the starry leaves of heaven; I know that science took the thunderbolts from the hands of Jupiter, and now the electric spark, freighted with thought and love, flashes under the waves of the sea; I know that science stole a tear from the cheek of unpaid labor, converted it into steam, and created a giant that turns with tireless arms the countless wheels of toil; I know that science broke the chains from human limbs and gave us instead the forces of nature for our slaves; I know that we have made the attraction of gravitation work for us; we have made the lightnings our messengers; we have taken advantage of fire and flames and wind and sea; these slaves have no backs to be whipped; they have no hearts to be lacerated; they have no children to be stolen, no cradles to be violated. I know that science has given us better houses; I know it has given us better pictures and better books; I know it has given us better wives and better husbands, and more beautiful children. I know it has enriched a thousand-fold our life; and therefore I am in favor of perfect intellectual liberty.