Converting to Catholicism is not a Move to Stop Thinking

To become a Catholic is not to leave off thinking, but to learn how to think. It is so in exactly the same sense in which to recover from palsy is not to leave off moving but to learn how to move. The Catholic convert has for the first time a starting-point for straight and strenuous thinking. He has for the first time a way of testing the truth in any question that he raises. As the world goes, especially at present, it is the other people, the heathen and the heretics, who seem to have every virtue except the power of connected thought. There was indeed a brief period when a small minority did some hard thinking on the heathen or heretical side. It barely lasted from the time of Voltaire to the time of Huxley. It has now entirely disappeared. What is now called free thought is valued, not because it is free thought, but because it is freedom from thought; because it is free thoughtlessness. --G.K. Chesterton The Catholic Church and Conversion