We find him, therefore, going diligently to all who claimed to be watchmen on the walls of Sion, to seek from each one personally that countersign which would tally with the divine word nature and grace were uttering in his own soul. He interviewed ministers repeatedly. "Not having had," he wrote in this magazine for November, 1887, "personal and experimental knowledge of the Protestant denominations, I investigated them all, going from one of them to another—Episcopal, Congregational, Baptist, Methodist, and all—conferring with their ministers and reading their books. It was a dreary business, but I did it. I knew Transcendentalism well and had been a radical socialist. All was found to be as stated above. Brownson's ripe experience and my own thoroughly earnest investigation tallied perfectly. Indeed, the more you examine the Protestant sects in the light of first principles the more they are found to weaken human certitude, interfere with reason's native knowledge of God and His attributes, and perplex the free working of the laws of human thought. Protestantism is no religion for a philosopher, unless he is a pessimist—if you can call such a being a philosopher—and adopts Calvinism."

Why Calvinism, with its dread consistency of aversion for human nature, did not attract him in these early inquiries was expressed by Father Hecker in after years by the saying, "Heresy always involves a mutilation of man's natural reason." The typical Calvinist foams against man's natural capacity for the true and the good, and one of its representatives, a Presbyterian minister, had the consistency to say to our young disciple of nature, "Unless you believe that you are totally depraved you will certainly suffer eternal damnation." These words were spoken to one who felt some sort of apostleship growing into act within his bosom: to preach the Gospel to those who are totally depraved he perceived to be both vain and suicidal. Furthermore, the consciousness of his own upright character, his experience and observation of human virtue in others, made abstract arguments needless to prove that Calvinism is an outrage on human kind and a blasphemy against the Creator.

Anglicanism, too—uncleansed, as it notoriously is, of a Calvinistic taint, broken up by absolute license of dissent, maintaining a mere outward conformity to an extremely lax discipline—affronted Isaac Hecker's ideal of the communion of man and God; man seeking and God giving the one only revelation of divine truth, unifying and organizing the Christian community: and this in spite of an attraction for the beauty of the Episcopal service which he often confesses in his diary.

In the same scrupulous spirit he tried the Baptists, though he must have known that they were, almost without exception, Calvinists. He had a conference with one of their ministers which, from the account he gives of it, must have degenerated into something like a wrangle. "If," said young Hecker, "you admit that baptism is not a saving ordinance, why, then, do you separate yourselves from the rest of Christendom on a mere question of ceremonial observance?" There could be no satisfactory answer to this question.

As to the Methodists, they made fifty years ago much less pretension to an intellectual footing in the religious world than at the present day. One thing, Father Hecker tells us, drew his sympathetic regards their way—their doctrine of perfection. He went to one of their ministers, a Dr. Crawford. "I have read in the Bible," said he, "'If thou wouldst be perfect, go and sell all thou hast'; now, that is the kind of Christian I want to be." The answer was: "Well, young man, you must not carry things too far; you are too enthusiastic. Christ does not require that of us in the nineteenth century." After conversing with him for some time, the minister told him to give up such ideas and study for the ministry.

A singular episode in his search was his meeting with two enthusiastic Mormon apostles, and a long and careful examination, under their guidance, of the then newly-delivered revelations and prophecies of Joseph Smith. He describes his Mormon acquaintances as men of some intelligence, but given over, totally and blindly, to Smith's imposture.

But what cut under the claims of every form of Protestantism was the error, common to them all, concerning the rule of faith: the private and independent judgment of the teaching of Scripture made by each man for himself. As the real owner of a homestead has most reason to dread a dealer in false titles, so the truly free man has most reason to dread false liberty. Isaac Hecker was the type of rational individual liberty, hence the very man to abhor most the caricature of that prerogative in the typical Protestant.

Five years before his death, in an article in The Catholic World entitled "Luther and the Diet of Worms," Father Hecker put the case thus: "It is a misapprehension common among Protestants to suppose that Catholics, in refusing the appeal of Martin Luther at the Diet of Worms, condemn the use of reason or individual judgment, or whatever one pleases to call the personal act which involves the exercise of man's intellect and free will. The truth is, personal judgment flows from what constitutes man a rational being, and there is no power under heaven that can alienate personal judgment from man, nor can man, if he would, disappropriate it. The cause of all the trouble at the Diet of Worms was not personal judgment, for neither party put that in question. The point in dispute was the right application of personal judgment. Catholics maintained, and always have and always will maintain, that a divine revelation necessitates a divine interpreter. Catholics resisted, and always will resist, on the ground of its incompetency, a human authority applied to the interpretation of the contents of a divinely-revealed religion. They consider such an authority, whether of the individual or the state, in religious matters an intrusion. Catholics insist, without swerving, upon believing in religion none but God. . . . To investigate and make one's self certain that God has made a revelation is of obligation, and consistent with Christianity. But as a divine revelation springs from a source above the sphere of reason, it necessitates a divinely authorized and divinely assisted interpreter and teacher. This is one of the essential functions of the Church."

That the use of the Scriptures is not, and cannot be made the ordinary means for making all men Christians, was plain to Isaac Hecker for other reasons than the essential one thus clearly stated. For, if such were the case, God would bestow on all men the gift to read at sight, or cause all to learn how to read, or would have recorded in the Book itself the words, "Unless a man reads the Bible, and believes what he reads, he cannot enter into the kingdom of God," or their plain equivalent; whereas the Bible, as we have it now, did not exist in the apostolic days, the most glorious era of the Christian Church. Such is Father Hecker's argument in a powerful article in The Catholic World for October, 1883. He continues:

"But suppose that everybody knew how to read, or all men were gifted to read at first sight; suppose that everybody had a copy of the Bible within his reach, a genuine Bible, and knew with certitude what it means; suppose that Christ himself had laid it down as a rule that the Bible, without note or comment, and as interpreted by each one for himself, is the ordinary way of receiving the grace of salvation—which is the vital principle of Protestantism; suppose all these evident assumptions as true. Would the Bible even in that case suffice to make any one man, woman, or child a Christian? Evidently not. And why? For that is a personal work, and the personal work of Christ; for Christ alone can make men Christians. And no account of Christ is Christ. . . The contents of a book, whatever these may be, are powerless to place its readers in direct contact and vital relations with its author. No man is so visionary as to imagine that the mental operation of reading the Iliad, or the Phædo, or the Divine Comedy, suffices to put him in communication with the personality of Homer, or Plato, or Dante. All effort is in vain to slake the thirst of a soul famishing for the Fountain of living waters from a brook, or to stop the cravings of a soul for the living Saviour with a printed book. . . . His words are 'Come unto ME all that are weary and heavy laden, and I will refresh you.' It was the attempt to make men Christians by reading the Bible that broke Christendom into fragments, multiplied jarring Christian sects, produced swarms of doubters, filled the world with sceptics and scoffers at all religion, frustrated combined Christian action, and put back the Christian conquest of the world for centuries. Three centuries of experience have made it evident enough that, if Christianity is to be maintained as a principle of life among men, it must be on another footing than the suicidal hypothesis invented in the sixteenth century after the birth of its divine Founder."