Now I have mentioned freedom to express your thoughts, but I caution you that your thoughts and expressions must meet competition in the market place of thought, and in that competition truth will emerge triumphant. Only error needs to fear freedom of expression. Seek truth in all fields, and in that search you will need at least three virtues; courage, zest, and modesty. The ancients put that thought in the form of a prayer. They said, ‘From the cowardice that shrinks from new truth, from the laziness that is content with half truth, from the arrogance that thinks it has all truth—O God of truth deliver us’.