In his youth he had been an extensive traveller and had seen with his own eyes the methods which the Spanish Inquisition employed to compel uniformity of faith and, with his whole moral being revolting from these unspiritual methods, he dedicated himself to the cause of liberty of religious thought, and for this he wrote and spoke and wrought with a fearlessness and bravery not often surpassed.[4] With this passion of his for intellectual and spiritual freedom was joined a deeply grounded disapproval of the fundamental ideas of Calvinism, as he found it expounded by the preachers and theologians of the Reformed Church in Holland. As a Humanist, he was convinced of man's freedom of will, and he was equally convinced that however man had been marred by a _fall_ from his highest possibilities, he was still possessed of native gifts and graces, and bore deep within himself an unlost central being, which in all his wanderings joined him indissolubly to God. On the great theological {107} issues of the day he "disputed," with penetrating insight, against the leading theologians of the Netherlands, and he always proved to be a formidable antagonist who could not be put down or kept refuted. Jacobus Arminius, at the turning of his career, was selected by the Consistory to make once for all a refutation of Coornhert's dangerous writings. He, however, became so impressed, as he studied the works which he was to refute, that he shifted his own fundamental points of belief, accepted many of Coornhert's views, and became himself a greater "heretic" and a more dangerous opponent of Calvinism than the man whom he was chosen to annihilate.[5]