“He who steadily observes the moral precepts in which all religions concur, will never be questioned at the gates of heaven as to the dogmas in which they all differ.”

Letter to John Adams, 5 May 1817, in The Writings of Thomas Jefferson (Lipscomb-Bergh edition, 1903), Volume XV, p. 109
1810s

Letter to William Canby (18 September 1813)
1810s
Context: Of all the systems of morality, ancient or modern, which have come under my observation, none appear to me so pure as that of Jesus. He who follows this steadily need not, I think, be uneasy, although he cannot comprehend the subtleties and mysteries erected on his doctrines by those who, calling themselves his special followers and favorites, would make him come into the world to lay snares for all understandings but theirs. These metaphysical heads, usurping the judgment seat of God, denounce as his enemies all who cannot perceive the Geometrical logic of Euclid in the demonstrations of St. Athanasius, that three are one, and one is three; and yet that the one is not three nor the three one.

Pearls of Wisdom

Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 38 ["… moral consciousness is an innate and intimate revelation of the absolute, which exceed every empirical data..." - see above].

From Naţionalitatea în artă ("Nationality in Art"), Bucureşti: Cartea Romaneasca, 1905.

A merely borrowed belief is, at such time, like a rotten plank across a raging torrent. The moment we step upon it, it gives way beneath our feet.
Section 9 : Ethical Outlook
Life and Destiny (1913)

Interview with Diane Sawyer, as quoted in "Stephen Hawking on Religion: 'Science Will Win'" on ABC World News (7 June 2010) http://abcnews.go.com/WN/Technology/stephen-hawking-religion-science-win/story?id=10830164

The Internet document known as "History Forgotten" or "Forsaken Roots" misquotes the opening of this section as follows: "It is impossible to govern the world without God and the Bible. Of all the dispositions and habits that lead to political prosperity, our religion and morality are the indispensable supports."
1790s, Farewell Address (1796)
Context: Of all the dispositions and habits, which lead to political prosperity, Religion and Morality are indispensable supports. In vain would that man claim the tribute of Patriotism, who should labor to subvert these great pillars of human happiness, these firmest props of the duties of Men and Citizens. The mere Politician, equally with the pious man, ought to respect and to cherish them. A volume could not trace all their connexions with private and public felicity.

Which Level of God Do You Believe In? (2004)
Context: There are several different meanings of the words "religion" and "spirituality," all of which are important. The whole point about an integral or comprehensive approach is that it must find a way to believably include all of those important meanings in a coherent whole.