“There are cynics who deny the existence of human gratitude. But it seems that I am no cynic. So convinced am I of the existence of gratitude that I see in it one of our strongest oppositions. There are millions of persons who receive favors that they forget: but gratitude does exist, and they've got to express it somewhere. They take it out by being grateful to science for all that science has done for them, a gratitude, which, according to their dull perceptions won't cost them anything. So there is economic indignation against anybody who is disagreeable to science. He is trying to rob the people of a cheap gratitude.
I like a bargain as well as does anybody else, but I can't save expenses by being grateful to Science, if for every scientist who has perhaps been of benefit to me, there have been many other scientists who have tried to strangle that possible benefit.”

Source: The Sacred Depths of Nature (1998), p. xvi
Context: Any global tradition needs to begin with a shared worldview — a culture-independent, globally accepted consensus as to how things are. From my perspective, this part is easy. How things are is, well, how things are; our scientific account of Nature, an account that can be called the Epic of Evolution… This is the story, the one story, that has the potential to unite us, because it happens to be true.
If religious emotions can be elicited by natural reality — and I believe that they can — then the story of Nature has the potential to serve as the cosmos for the global ethos that we need to articulate. I will not presume to suggest what this ethos might look like. Its articulation must be a global project. But I am convinced that the project can be undertaken only if we all experience a solemn gratitude that we exist at all, share a reverence for how life works, and acknowledge a deep and complex imperative that life continue.

"Proclamation 3560 — Thanksgiving Day, 1963" (5 November 1963) http://www.presidency.ucsb.edu/ws/?pid=9511<!-- Online by Gerhard Peters and John T. Woolley, The American Presidency Project -->
1963
Context: Today we give our thanks, most of all, for the ideals of honor and faith we inherit from our forefathers —  for the decency of purpose, steadfastness of resolve and strength of will, for the courage and the humility, which they possessed and which we must seek every day to emulate. As we express our gratitude, we must never forget that the highest appreciation is not to utter words but to live by them.
Let us therefore proclaim our gratitude to Providence for manifold blessings — let us be humbly thankful for inherited ideals — and let us resolve to share those blessings and those ideals with our fellow human beings throughout the world.

29
Ki Sayings (2003)

De Beneficiis (On Benefits): Book 2, cap. 22, line 1.
Moral Essays

Source: Revelation

Heath's book of Beauty, 1833 (1832)