For some seven centuries after the fall of the Roman Empire persecutions for heresy were very rare and very slight. This, however, cannot be attributed to mercy. Although some of the old heresies survived, yet they were so sapped of their vitality that they were no longer openly flaunted in defiance of the mother-Church, but were practised in such obscurity as, in the main, to escape observation. Fresh schisms, on the other hand, do not appear to have sprung up during that spell. Largely this would be due to the clear formulation of the Catholic theology by the various œcumenical councils held in the years that followed upon the Christian emancipation, and by the intellectual breadth of these doctrines, which were entirely adequate and all-sufficient to the intellectual capacity of the time. But this state of things could only have endured at the cost of arresting man’s intellectual progress. A certain restraint and curb undoubtedly was exerted, but definitely to check the imaginative and reasoning faculties of man has never been within the power of any creed, and never can be. It was in vain that the Church sought to coerce thought and to stifle the learning that struck at her very foundations and discovered the error of the cosmic and historical conceptions upon which her theology was based; in vain that she entrenched herself within her doctrines, and adhered rigidly to the form she had adopted. Upon this uncompromising rigidity of the Catholic Church much censure has been poured. The present aim is a cold survey of certain features of history, and in such a task all polemical matters should be avoided. Yet it may be permissible to say a word here to elucidate rather than to defend an attitude that has been unduly abused. It is admitted that the unyielding policy of the Church was one that militated seriously against intellectual evolution, and on that account it is to be deplored. But let the unbiassed mind consider for a moment the alternative. The admission of error is the commencement of disruption. Where one error is admitted, a thread is drawn from a weft whose threads are interdependent for the stability of the whole. Who has yielded once has set up a precedent that will be urged against him to make him yield again, and yet again, until he shall have yielded all, and, having nothing left, must suffer an imperceptible effacement.