Regarding Calvin's On the Necessity of Reforming the Church Eire notes,
"Calvin speaks about the nature of worship and about the seriousness of the sin of idolatry in his 1543 treatise, On the Necessity of Reforming the Church, where he concentrates on the significance of worship for the Christian religion. Calvin's argument, as indicated by the title of the treatise, is that the Church had reached such a corrupt state that its reform could wait no longer. The most significant aspect of corruption singled out by Calvin is the perversion of worship, and it is in explaining this issue that he set forth the basis for his attack on idolatry.
Calvin begins by studying the place that worship holds in the Christian faith, and he concludes that it is one of the two elements that define Christianity:
'If it be asked, then, by what things chiefly the Christian religion has a standing amongst us, and maintains its truth, it will be found that the following two not only occupy the principal place, but comprehend under them all the other parts, and consequently the whole substance of Christianity, viz., a knowledge first, of the right way to worship God; and secondly of the source from which salvation is to be sought. When these are kept out of view, though we may glory in the name of Christians, our profession is empty and vain.'"
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This man, undoubtedly the greatest of Protestant divines, and perhaps, after St. Augustine, the most perseveringly followed by his disciples of any Western writer on theology, was born at Noyon in Picardy, France, 10 July, 1509, and died at Geneva, 27 May, 1564.