St. Paul, we should find, if we were to investigate the matter, is wholly true in his interpretation of the Old Testament in general. He interprets its spirit and meaning with perfect insight. But he is not always what we should call critically exact, any more than the other interpreters of his day, in his use of particular texts. Thus, in this chapter he gives to some words of Isaiah[13] a meaning which is indeed to be found elsewhere in the prophets[14], but does not really belong to the original of this particular passage. Isaiah is saying that God's name is being blasphemed _by the oppressors of {112} Israel_--'Continually all day long my name is blasphemed.' But the Greek version of the Bible inserted the words 'through you' (the Jews[15]); and St. Paul interprets this insertion to mean that it was the moral inconsistency of the chosen people themselves which caused God's name to be blasphemed. Perhaps the fact that he uses the formula of quotation 'as it is written' after the words referred to, is a sign that he had employed the words in his own sense before he became conscious that they were in fact a quotation. But in any case he shows no anxiety to follow critically the original meaning of a particular passage which he cites. At the end of this passage occurs the antithesis familiar in modern language of 'the letter and the spirit.' In its modern sense it is used as equivalent to the literal and the metaphorical, or the definite and the vague. But this is not at all its sense in St. Paul. With him 'the letter' means the written law, and 'spirit' means, in this connexion, what we may broadly describe as vital moral energy. Thus, {113} in its most characteristic use with St. Paul, the antithesis distinguishes the mere external information as to God's will, which was all the written law ('the letter') could give the Jews, from the activity of the Holy Spirit or the spiritual power of moral freedom which, through the gifts of the Holy Spirit, we enjoy under the gospel. In this passage the antithesis is similar, but not the same. It contrasts the merely physical state of circumcision according to the written law--'with the letter and circumcision' means 'having the written law and being accordingly circumcised'--with what the Old Testament had called 'the circumcised heart,' i.e. the really obedient will or 'spirit' which may exist independently of the outward rite. 'Spirit,' we observe, may refer to the activity of either the Holy Spirit of God, or of the human will, or of both without discrimination.