The origin of the quotation on WJ Miles' grave may be:
To fear death is nothing other than to think onesself wise when one is not. For it is to think one knows what one does not know. No man knows whether death may not even turn out to be the greatest of blessings for a human being; and yet people fear it as if they knew for certain that it is the greatest of evils.
-- attributed to Socrates [further details unknown by me]