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How did the idea of doctrinal development influence John Henry Newman's conversion to Roman Catholicism?

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St. John Henry Newman English prelate, theologian, and poet John Henry Newman converted to Roman Catholicism in 1845. He was made a cardinal in 1879.

John Henry Newman’s conversion to Roman Catholicism was fundamentally shaped by his intellectual struggle to reconcile the historical differences between the early church and the modern Roman Catholic Church.1

Newman applied the concept of development—a process of "germination and maturation"—to Christian history. He argued that a "great idea" requires time and deep thought for its full elucidation, and he sought to demonstrate that the early, undivided church had evolved legitimately into the modern Roman Catholic Church. Conversely, he concluded that Protestant churches represented a break in this organic development, characterized by departures in both doctrine and devotion.12

By meditating on this law of historical development, Newman resolved the intellectual obstacles that had long delayed his departure from the Church of England. This realization led to his conversion in 1845 and the subsequent publication of his Essay on the Development of Christian Doctrine, which provided a theological framework for understanding how doctrines could remain true to their origins while maturing over time.12