“Conscience is the most sacred thing among men. Every man has within him a still small voice, which tells him that nothing on earth can oblige him to believe that which he does not believe. The worst of all tyrannies is that which obliges eighteen-twentieths of a nation to embrace a religion contrary to their beliefs, under penalty of being denied their rights as citizens and of owning property, which, in effect, is the same thing as being without a country.”