Other illustrations of a less tragical kind might be given. Thus in cases of child-birth the physician is sometimes placed in the alternative of sacrificing the life of the mother or of the unborn child. In such cases a Protestant or freethinking physician would not hesitate to save the adult life as by far the most valuable. The Catholic doctrine is that under such circumstances the first duty of the physician is to save the life of the unbaptized child.[18] Large numbers of commercial transactions which are now universally acknowledged to be perfectly innocent and useful would during a long period have been prohibited on account of the Catholic doctrine of usury which condemned as sinful even the most moderate interest on money if it was exacted as the price of the loan.[19] Every religious and indeed every philosophical system that has played a great part in the history of the world has a tendency either to form or to assimilate with a particular moral type, and in the eyes of a large and growing number it is upon the excellency of this type, and upon its success in producing it, that its superiority mainly depends. The superstructure or scaffolding of belief around which it is formed appears to them of comparatively little moment, and it is not uncommon to find men ardently devoted to a particular type long after they have discarded the tenets with which it was once connected. Carlyle, for example, sometimes spoke of himself as a Calvinist, and used language both in public and private as if there was no important difference between himself and the most orthodox Puritans, yet it is very evident that he disbelieved nearly all the articles of their creed. What he meant was that Calvinism had produced in all countries in which it really dominated a definite type of character and conception of morals which was in his eyes the noblest that had yet appeared in the world.