6. How, then, is work perfected in the number forty? The reason, it may be, is, because the law was given in ten precepts, and was to be preached throughout the whole world: which whole world, we are to mark, is made up of four quarters, east and west, south and north, whence the number ten, multiplied by four, comes to forty. Or, it may be, because the law is fulfilled by the gospel, which has four books: for in the gospel it is said, “I came not to destroy the law, but to fulfill it.” Whether, then, it be for this reason or for that, or for some other more probable, which is hid from us, but not from more learned men; certain it is, however, that in the number forty a certain perfection in good works is signified, which good works are most of all practised by a kind of abstinence from unlawful lusts of the world, that is, by fasting in the general sense.