Their courage should equal their intelligence. No matter what the dead have said, or the living believe, they should tell what they know. They should have intellectual courage.
If it be good for man to find the truth—good for him to be intellectually honest and hospitable, then it is good for others to know the truths thus found.
Every man should have the courage to give his honest thought. This makes the finder and publisher of truth a public benefactor.
Those who prevent, or try to prevent, the expression of honest thought, are the foes of civilization—the enemies of truth. Nothing can exceed the egotism and impudence of the man who claims the right to express his thought and denies the same right to others.
It will not do to say that certain ideas are sacred, and that man has not the right to investigate and test these ideas for himself.
Who knows that they are sacred? Can anything be sacred to us that we do not know to be true?
For many centuries free speech has been an insult to God. Nothing has been more blasphemous than the expression of honest thought. For many ages the lips of the wise were sealed. The torches that truth had lighted, that courage carried and held aloft, were extinguished with blood.
Truth has always been in favor of free speech—has always asked to be investigated—has always longed to be known and understood. Freedom, discussion, honesty, investigation and courage are the friends and allies of truth. Truth loves the light and the open field. It appeals to the senses—to the judgment, the reason, to all the higher and nobler faculties and powers of the mind. It seeks to calm the passions, to destroy prejudice and to increase the volume and intensity of reason's flame.
It does not ask man to cringe or crawl. It does not desire the worship of the ignorant or the prayers and praises of the frightened. It says to every human being, "Think for yourself. Enjoy the freedom of a god, and have the goodness and the courage to express your honest thought."
Why should we pursue the truth? and why should we investigate and reason? and why should we be mentally honest and hospitable? and why should we express our honest thoughts? To this there is but one answer: for the benefit of mankind.