“It may not be easy, in every possible case, to trace the line of separation between the rights of religion and the Civil authority with such distinctness as to avoid collisions and doubts on unessential points. The tendency to usurpation on one side or the other, or to a corrupting coalition or alliance between them, will be best guarded agst. by an entire abstinence of the Govt. from interference in any way whatsoever, beyond the necessity of preserving public order, and protecting each sect agst. trespasses on its legal rights by others.[Letter to the Reverend Jasper Adams, January 1, 1832]”

“Every new & successful example therefore of a perfect separation between ecclesiastical and civil matters, is of importance. And I have no doubt that every new example, will succeed, as every past one has done, in shewing that religion & Govt. will both exist in greater purity, the less they are mixed together.[Letter to Edward Livingston, 10 July 1822 - Writings 9:100--103]”

“...But besides the danger of a direct mixture of Religion & civil Government, there is an evil which ought to be guarded agst in the indefinite accumulation of property from the capacity of holding it in perpetuity by ecclesiastical corporations....Is the appointment of Chaplains to the two Houses of Congress consistent with the Constitution, and with the pure principle of religious freedom?In strictness the answer on both points must be in the negative. The Constitution of the U. S. forbids everything like an establishment of a national religion. The law appointing Chaplains establishes a religious worship for the national representatives, to be performed by Ministers of religion, elected by a majority of them; and these are to be paid out of the national taxes. Does not this involve the principle of a national establishment, applicable to a provision for a religious worship for the Constituent as well as of the representative Body, approved by the majority, and conducted by Ministers of religion paid by the entire nation.The establishment of the chaplainship to Congs is a palpable violation of equal rights, as well as of Constitutional principles: The tenets of the chaplains elected [by the majority] shut the door of worship agst the members whose creeds & consciences forbid a participation in that of the majority....Better also to disarm in the same way, the precedent of Chaplainships for the army and navy, than erect them into a political authority in matters of religion.[Detached Memoranda, ca. 1817 W. & M. Q., 3d ser., 3:554--60 1946]”

“She had never asked herself whether it cost him any effort. Any effort to stand between Will and the world, protecting each one of them from the other.”

“We can move to legalize same-gender civil marriage without harming any religious institution or dictating any change to the beliefs and practices of any faith. Religious opposition to civil marriage for same-gender couples irrelevant to the civil, public debate. You're opposed to gay marriage on religious grounds? Fine! Don't authorize your clergy to act as an agent of the State in any such unions. But don't deprive the rest of, who believe that such rites are good and holy, of our constitutional rights to practice our own freedom of religion. We don't live in a theocracy where some one understanding of religion and faith dictates what the State will and will not do. This religious argument against the right to marry for gay and lesbian couples is simply bogus. And unconstitutional. Religious belief should have no bearing whatsoever on the legal right to marry.”

“There are transitional forms between the metals and non-metals; between chemical combinations and simple mixtures, between animals and plants, between phanerogams and cryptogams, and between mammals and birds [...]. The improbability may henceforth be taken for granted of finding in Nature a sharp cleavage between all that is masculine on the one side and all that is feminine on the other; or that any living being is so simple in this respect that it can be put wholly on one side, or wholly on the other, of the line.”