Jean Paul Sartre quote: “It is only in our decisions that we are important.”

“We always have the opportunity to choose our better history. We can always understand that most important decision -- the decision we make when we find our common humanity in one another. That’s always available to us, that choice.”

Barack Obama (1961) 44th President of the United States of America

2013, Cape Town University Address (June 2013)
Context: We always have the opportunity to choose our better history. We can always understand that most important decision -- the decision we make when we find our common humanity in one another. That’s always available to us, that choice. [... ] it can be heard in the confident voices of young people like you. It is that spirit, that innate longing for justice and equality, for freedom and solidarity -- that’s the spirit that can light the way forward. It's in you.

“Faith plays an important role in an open society. Exactly because our understanding is imperfect, we cannot base our decisions on knowledge alone. We need to rely on beliefs, religious or otherwise, to help us make decisions. But we must remain open to the possibility that we may be wrong so that we can correct our mistakes. Otherwise, we are bound to be wrong.”

George Soros (1930) Hungarian-American business magnate, investor, and philanthropist

Speech at the National Press Club (2004)

“If you import a commercial quantity of illegal drugs, it is because you have made the personal decision that you are prepared to get rich by destroying our children. I have made the decision that I love our children enough that we will kill you if you do this.”

Newt Gingrich (1943) Professor, Speaker of the United States House of Representatives

1995-08-27
Gingrich Suggests Tough Drug Measure
New York Times
0362-4331
http://www.nytimes.com/1995/08/27/us/gingrich-suggests-tough-drug-measure.html
2011-12-12
Former Marijuana User Newt Gingrich Proposed the Death Penalty for Trafficking Marijuana in 1996
Paul
Constant
The Stranger
http://slog.thestranger.com/slog/archives/2011/12/12/former-marijuana-user-newt-gingrich-proposed-the-death-penalty-for-trafficking-marijuana-in-1996
regarding his "Drug Importer Death Penalty Act of 1996" (H.R. 4170) bill
1990s

“It is important only to remember that the 'choice of goals and the formulation of policy cannot in any case be separate decisions.”

Kenneth R. Andrews (1916–2005) Business scholar

Source: Quote, The Concept of Strategy, 1971, p. 30

“The most important decision we can make is whether this is a friendly or hostile universe. From that one decision all others spring.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

Multiple variations of this quote can be found, but the earliest one on Google Books which uses the phrase "friendly or hostile" and attributes it to Einstein is The Complete Idiot's Guide to Spiritual Healing by Susan Gregg (2000), p. 5 http://books.google.com/books?id=XLQ8X67PozAC&lpg=PP1&pg=PA5#v=onepage&q&f=false, and this book gives no source for the quote.
A variant is found in Irving Oyle's The New American Medicine Show (1979) on p. 163, where Oyle writes: 'There is a story about Albert Einstein's view of human existence. Asked to pose the most vital question facing humanity, he replied, "Is the universe friendly?"' This variant is repeated in a number of books from the 1980s and 90s, so it probably pre-dates the "friendly or hostile" version. And the idea that the most important question we can ask is "Is the universe friendly?" dates back much earlier than the attribution to Einstein, for example in Emil Carl Wilm's 1912 book The Problem of Religion he includes the following footnote on p. 114 http://books.google.com/books?id=nWYiAAAAYAAJ&pg=PA114#v=onepage&q&f=false: 'A friend proposed to the late F. W. H. Myers the following question: "What is the thing which above all others you would like to know? If you could ask the Sphinx one question, and only one, what would the question be?" After a moment's silence Myers replied: "I think it would be this: Is the universe friendly?"'
Misattributed

“No trumpets sound when the important decisions of our life are made. Destiny is made known silently.”

Agnes de Mille (1905–1993) American dancer and choreographer

“If we accept values as given and consistent, if we postulate an objective description of the world as it really is, and if we assume that the decision maker's computational powers are unlimited, then two important consequences follow. First, we do not need to distinguish between the real world and the decision maker's perception of it: he or she perceives the world as it really is. Second, we can predict the choices that will be made by a rational decision maker entirely from our knowledge of the real world and without a knowledge of the decision maker's perceptions or modes of calculation. (We do, of course, have to know his or her utility function.)
If, on the other hand, we accept the proposition that both the knowledge and the computational power of the decision maker are severely limited, then we must distinguish between the real world and the actor's perception of it and reasoning about it. That is to say, we must construct a theory (and test it empirically) of the processes of decision. Our theory must include not only the reasoning processes but also the processes that generate the actor's subjective representation of the decision problem, his or her frame.”

Herbert A. Simon (1916–2001) American political scientist, economist, sociologist, and psychologist

H.A. Simon (1986), " Rationality in psychology and economics http://www.kgt.bme.hu/targyak/msc/ng/BMEGT30MN40/data/JoBus-86-rationality-HSimon.pdf," Journal of Business, p. 210-11”
1980s and later