“The line of cleavage drawn on principle and conduct in public affairs is never in any healthy community identical with the line of cleavage between creed and creed or between class and class. On the contrary, where the community life is healthy, these lines of cleavage almost always run nearly at right angles to one another. It is eminently necessary to all of us that we should have able and honest public officials in the nation, in the city, in the state. If we make a serious and resolute effort to get such officials of the right kind, men who shall not only be honest but shall be able and shall take the right view of public questions, we will find as a matter of fact that the men we thus choose will be drawn from the professors of every creed and from among men who do not adhere to any creed.”

Source: Survivals and New Arrivals (1929), Ch. IV The Main Opposition (ii) Anti-Clericalism

1910s, Address to the Knights of Columbus (1915)
Context: For thirty-five years I have been more or less actively engaged in public life, in the performance of my political duties, now in a public position, now in a private position. I have fought with all the fervor I possessed for the various causes in which with all my heart I believed; and in every fight I thus made I have had with me and against me Catholics, Protestants, and Jews. There have been times when I have had to make the fight for or against some man of each creed on ground of plain public morality, unconnected with questions of public policy. There were other times when I have made such a fight for or against a given man, not on grounds of public morality, for he may have been morally a good man, but on account of his attitude on questions of public policy, of governmental principle. In both cases, I have always found myself 4 fighting beside, and fighting against, men of every creed. The one sure way to have secured the defeat of every good principle worth fighting for would have been to have permitted the fight to be changed into one along sectarian lines and inspired by the spirit of sectarian bitterness, either for the purpose of putting into public life or of keeping out of public life the believers in any given creed. Such conduct represents an assault upon Americanism. The man guilty of it is not a good American. I hold that in this country there must be complete severance of Church and State; that public moneys shall not be used for the purpose of advancing any particular creed; and therefore that the public schools shall be non-sectarian. As a necessary corollary to this, not only the pupils but the members of the teaching force and the school officials of all kinds must be treated exactly on a par, no matter what their creed; and there must be no more discrimination against Jew or Catholic or Protestant than discrimination in favor of Jew, Catholic or Protestant. Whoever makes such discrimination is an enemy of the public schools.

Book I, Chapter I, Of The Definitions of Wealth and of Productive Labour, Section II, p. 43
Principles of Political Economy (Second Edition 1836)

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Otto Neurath (1983) "The orchestration of the sciences by the encyclopedism of logical empiricism." In R. S. Cohen, M. Neurath, & C. R. Fawcett (Eds.), Otto Neurath: Philosophical papers, 1913–1946 (pp. 230–242). Boston: Riedel. (First published 1946); p. 239
1940s and later

The New Divinity (1964)
Context: The entire cosmos is made out of one and the same world-stuff, operated by the same energy as we ourselves. "Mind" and "matter" appears as two aspects of our unitary mind-bodies. There is no separate supernatural realm: all phenomena are part of one natural process of evolution. There is no basic cleavage between science and religion; they are both organs of evolving humanity.

1910s, Address to the Knights of Columbus (1915)
Context: I appeal to history. Among the generals of Washington in the Revolutionary War were Greene, Putnam, and Lee, who were of English descent; Wayne and Sullivan, who were of Irish descent; Marion, who was of French descent; Schuyler, who was of Dutch descent, and Muhlenberg and Herkimer, who were of German descent. But they were all of them Americans and nothing else, just as much as Washington. Carroll of Carrollton was a Catholic; Hancock a Protestant; Jefferson was heterodox from the standpoint of any orthodox creed; but these and all the other signers of the Declaration of Independence stood on an equality of duty and right and liberty, as Americans and nothing else.
Context: The line of cleavage drawn on principle and conduct in public affairs is never in any healthy community identical with the line of cleavage between creed and creed or between class and class. On the contrary, where the community life is healthy, these lines of cleavage almost always run nearly at right angles to one another. It is eminently necessary to all of us that we should have able and honest public officials in the nation, in the city, in the state. If we make a serious and resolute effort to get such officials of the right kind, men who shall not only be honest but shall be able and shall take the right view of public questions, we will find as a matter of fact that the men we thus choose will be drawn from the professors of every creed and from among men who do not adhere to any creed.

Source: The Summoning