“Time and space are modes by which we think and not conditions in which we live.”
Earliest source located that attributes this to Einstein is the 1975 book The Nature of Scientific Discovery: A Symposium Commemorating the 500th Anniversary of the Birth of Nicolaus Copernicus edited by Owen Gingerich, p. 585 http://books.google.com/books?id=Ub3gAAAAMAAJ&q=%22certainly+a+central%22#search_anchor. But long before that, the 1944 book Einstein: An Intimate Study of a Great Man by Dimitri Marianoff and Palma Wayne contains the following quote on p. 62: "But Einstein came along and took space and time out of the realm of stationary things and put them in the realm of relativity—giving the onlooker dominion over time and space, because time and space are modes by which we think and not conditions in which we live." It appears from the quote that the authors were giving their own description of Einstein's ideas, not quoting him.
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Albert Einstein 702
German-born physicist and founder of the theory of relativi… 1879–1955Related quotes

From 1980s onwards, Cosmography (1992)
Context: The dark ages still reign over all humanity, and the depth and persistence of this domination are only now becoming clear.
This Dark Ages prison has no steel bars, chains, or locks. Instead, it is locked by misorientation and built of misinformation. Caught up in a plethora of conditioned reflexes and driven by the human ego, both warden and prisoner attempt meagerly to compete with God. All are intractably skeptical of what they do not understand.
We are powerfully imprisoned in these Dark Ages simply by the terms in which we have been conditioned to think.

“We on Earth have just awakened to the great oceans of space and time from which we have emerged.”
Cosmos: A Personal Voyage (1990 Update), The Shores of the Cosmic Ocean [Episode 1]
Context: We on Earth have just awakened to the great oceans of space and time from which we have emerged. We are the legacy of 15 billion years of cosmic evolution. We have a choice: We can enhance life and come to know the universe that made us, or we can squander our 15 billion-year heritage in meaningless self-destruction. What happens in the first second of the next cosmic year depends on what we do, here and now, with our intelligence and our knowledge of the cosmos.

Prologue p. 10
The Sabbath (1951)

Essentials to Peace (1953)
Context: The points I have just discussed are, of course, no more than a very few suggestions in behalf of the cause of peace. I realize that they hold nothing of glittering or early promise, but there can be no substitute for effort in many fields. There must be effort of the spirit — to be magnanimous, to act in friendship, to strive to help rather than to hinder. There must be effort of analysis to seek out the causes of war and the factors which favor peace, and to study their application to the difficult problems which will beset our international intercourse. There must be material effort — to initiate and sustain those great undertakings, whether military or economic, on which world equilibrium will depend.
If we proceed in this manner, there should develop a dynamic philosophy which knows no restrictions of time or space. In America we have a creed which comes to us from the deep roots of the past. It springs from the convictions of the men and women of many lands who founded the nation and made it great. We share that creed with many of the nations of the Old World and the New with whom we are joined in the cause of peace.

Source: 1930s, On my Painting (1938), p. 12

The Reappearance of the Christ and the Masters of Wisdom (1980)