Yet the bishop adds, 'appointed days are indispensable to her efficiency.' This was soon found to be the case. Probably before the end of the first century, the _Didache_ mentions not only the observance of Sunday by the eucharistic service, but the observance also of the Wednesday and Friday fasts. Clement, about the same date, strongly emphasizes the principle of order in place and time, as still belonging to Christian worship. 'They, therefore, that make their offering at the appointed seasons are acceptable and blessed.' The Canons of Hippolytus show that by the end of the second century there must have been a great development of ecclesiastical regulations, so far restraining the individual {154} liberty of the earliest days, and that, as far as we know, without protest or sense of alarm. Nor need St. Paul have been in opposition to such church rules. The spirit of regulation is strong in him[32]. On the other hand, there is no doubt that the Church has not generally, one might say has hardly ever, been conscious, as St. Paul was, of the danger of religious regulations as such. It is so much easier to keep certain rules than to acquire and maintain a certain mind and spirit and principle of action. In the history of the Church St. Paul, we feel, would very often have been saying, 'I am afraid of you: the rules are good in themselves, but there are dangers attaching to all rules of which you seem to be quite unconscious. There is a lower sort of religion of forms and observances, and you may fall back into it as easily as the Galatians.'