“Is there to be no development of religion in the Church of Christ? Certainly, there is to be development and on the largest scale.
Who can be so grudging to men, so full of hate for God, as to try to prevent it? But it must truly be development of the faith, not alteration of the faith. Development means that each thing expands to be itself, while alteration means that a thing is changed from one thing into another.
The understanding, knowledge and wisdom of one and all, of individuals as well as of the whole Church, ought then to make great and vigorous progress with the passing of the ages and the centuries, but only along its own line of development, that is, with the same doctrine, the same meaning and the same import.
The religion of souls should follow the law of development of bodies. Though bodies develop and unfold their component parts with the passing of the years, they always remain what they were. There is a great difference between the flower of childhood and the maturity of age, but those who become old are the very same people who were once young. Though the condition and appearance of one and the same individual may change, it is one and the same nature, one and the same person. […]
In the same way, the doctrine of the Christian religion should properly follow these laws of development, that is, by becoming firmer over the years, more ample in the course of time, more exalted as it advances in age. […]
There should be no inconsistency between first and last, but we should reap true doctrine from the growth of true teaching, so that when, in the course of time, those first sowings yield an increase it may flourish and be tended in our day also.”
From the first instruction by Saint Vincent of Lerins (5th century A.D.)