Put the argument into a concrete shape, into an image, some hard phrase, round and solid as a ball, which they can see and handle and carry home with them, and the cause is half won.
Neither a person nor a nation can exist without some higher idea. And there is only one higher idea on earth, and it is the idea of the immortality of the human soul, for all other "higher" ideas of life by which humans might live derive from that idea alone.
Freedom can never be true of name and form; it is the clay out of which we (the pots) are made; then it is limited and not free, so that freedom can never be true of the related. One pot can never say "I am free" as a pot; only as it loses all ideas of form does it become free.
No civilisation can grow unless fanatics, bloodshed, and brutality stop. No civilisation can begin to lift up its head until we look charitably upon one another; and the first step towards that much-needed charity is to look charitably and kindly upon the religious convictions of others. Nay more, to understand that not only should we be charitable, but positively helpful to each other, however different our religious ideas and convictions may be.
Education perverts the mind since we are directly opposing the natural development of our mind by obtaining ideas first and observations last. This is why so few men of learning have such sound common sense as is quite common among the illiterate.
The idea of overcoming is always fascinating to me. It's fascinating because few of us realize how much energy we have expended just to be here today. I don't think we give ourselves enough credit for the overcoming.