The truth isn't the truth until people believe you, and they can't believe you if they don't know what your saying, and they can't know what you've saying if they don't listen to you, and they won't listen to you if you're not interesting, and you won't be interesting until you say things imaginatively, originally, freshly.
Let one who wants to move and convince others, first be convinced and moved themselves. If a person speaks with genuine earnestness the thoughts, the emotion and the actual condition of their own heart, others will listen because we all are knit together by the tie of sympathy.
Roughly speaking, any man with energy and enthusiasm ought to be able to bring at least a dozen others round to his opinion in the course of a year no matter how absurd that opinion might be. We see every day in politics, in business, in social life, large masses of people brought to embrace the most revolutionary ideas, sometimes within a few days. It is all a question of getting hold of them in the right way and working on their weak points.
As there is no worse lie than a truth misunderstood by those who hear it, so reasonable arguments, challenges to magnanimity, and appeals to sympathy or justice, are folly when we are dealing with human crocodiles and boa-constrictors.