Though at first it seems quite simple and straightforward and though he devotes hundreds of pages to its exposition, Calvin's idea of law is subtle and elusive. He, like Luther, stresses the Protestant principle of justification by grace alone, but not a few interpreters have seen him as the severest of legalists who finally relegates grace to the position of being merely a means to works righteousness. It is undoubtedly pretentious to try to put law in its ‘true’ meaning and context in Calvin's schema. This paper must therefore be regarded as simply an exploratory effort in that direction.
Since Calvin was himself a competent student of the secular law, a fruitful method for investigating this problem would be to inquire into the character of the legal studies that formed such an important part of his background. How did he regard the Roman Law which had been shaping European civilisation for several centuries? To what extent was he influenced by Greek versions of the Natural Law which had been so important to Thomas Aquinas? In the English language we make the word ‘law’ (like ‘love’) carry, somewhat promiscuously, nuances of meaning that the more analytical languages of Latin and Greek distinguish. The tools of Philology and History may be necessary for a definitive examination of Calvin's concept of law.