“When we accept the temporary nature of everything in our lives, we can feel gratitude for the good fortune of getting to borrow them for a time.”

Source: Lord of Shadows

Section 6 : Higher Life
Founding Address (1876), Life and Destiny (1913)
Context: An ideal is a port toward which we resolve to steer. We may not reach it. The mere fact that our goal is definitely located does not suffice to conduct us thither. But surely we shall thus stand a better chance of making port in the end than if we drift about aimlessly, the sport of winds and tides, without having decided in our own minds in what direction we ought to bend our course.
The moral law is the expression of our inmost nature, and when we live in consonance with it we feel that we are living out our true being.

"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.

Source: The Lover's Dictionary

Discourse Delivered at the Royal Society (30 November 1825), published in Six Discourses delivered before the Royal Society, at their Anniversary Meetings, on the Award of the Royal and Copley Medals, preceded by an Address to the Society on the Progress and Prospects of Science (1827); also in The Edinburgh Review Or Critical Journal (October 1827)
Context: Fortunately science, like that nature to which it belongs, is neither limited by time nor by space. It belongs to the world, and is of no country and of no age. The more we know, the more we feel our ignorance; the more we feel how much remains unknown; and in philosophy, the sentiment of the Macedonian hero can never apply, — there are always new worlds to conquer.

" My Philanthropic Pledge http://givingpledge.org/pdf/letters/Buffett_Letter.pdf" at the The Giving Pledge (2010)
Context: Some material things make my life more enjoyable; many, however, would not. I like having an expensive private plane, but owning a half-dozen homes would be a burden. Too often, a vast collection of possessions ends up possessing its owner. The asset I most value, aside from health, is interesting, diverse, and long-standing friends.
My wealth has come from a combination of living in America, some lucky genes, and compound interest. Both my children and I won what I call the ovarian lottery. (For starters, the odds against my 1930 birth taking place in the U. S. were at least 30 to 1. My being male and white also removed huge obstacles that a majority of Americans then faced.) My luck was accentuated by my living in a market system that sometimes produces distorted results, though overall it serves our country well. I’ve worked in an economy that rewards someone who saves the lives of others on a battlefield with a medal, rewards a great teacher with thank-you notes from parents, but rewards those who can detect the mispricing of securities with sums reaching into the billions. In short, fate’s distribution of long straws is wildly capricious.
The reaction of my family and me to our extraordinary good fortune is not guilt, but rather gratitude. Were we to use more than 1% of my claim checks on ourselves, neither our happiness nor our well-being would be enhanced. In contrast, that remaining 99% can have a huge effect on the health and welfare of others. That reality sets an obvious course for me and my family: Keep all we can conceivably need and distribute the rest to society, for its needs. My pledge starts us down that course.

Source: How to Stop Worrying and Start Living

Source: Gertrude (1910), p. 236
Context: It was no different with my own life, and with Gertrude's and that of many others. Fate was not kind, life was capricious and terrible, and there was no good or reason in nature. But there is good and reason in us, in human beings, with whom fortune plays, and we can be stronger than nature and fate, if only for a few hours. And we can draw close to one another in times of need, understand and love one another, and live to comfort each other. And sometimes, when the black depths are silent, we can do even more. We can then be gods for moments, stretch out a commanding hand and create things which were not there before and which, when they are created, continue to live without us. Out of sounds, words, and other frail and worthless things, we can construct playthings — songs and poems full of meaning, consolation and goodness, more beautiful and enduring than the grim sport of fortune and destiny. We can keep the spirit of God in our hearts and, at times, when we are full of Him, He can appear in our eyes and our words, and also talk to others who do no know or do not wish to know Him. We cannot evade life's course, but we can school ourselves to be superior to fortune and also to look unflinchingly upon the most painful things.

Source: Detective Story (2008), p. 66.
Context: "You mustn’t forget about your future, Enrique."
"I’m living for the present, Dad."
"Ah!" he waved that aside. "The present is just temporary."
‘ I boiled up. "I know," I burst out. ‘It only has to be accepted temporarily — temporarily, but every day afresh. And every day ever more. Temporarily. Until we have lived to the end of our temporary lives, and one fine day we temporarily die.