“The fact that this enterprise is being begun in one of our new states not yet great in population, not largely developed in its resources, discloses that the old American spirit still goes where our people go, still dominates their lives, still inspires them to deeds of devotion and sacrifice. It is but another illustration of the determination of our people to use their material resources to minister to their spiritual life. This memorial will be another national shrine to which future generations will repair to declare their continuing allegiance to independence, to self-government, to freedom and to economic justice. It is an inspiring phase of American life that men are willing to devote their energies to the erection of a memorial of this nature. Money spent for such a purpose is certain of adequate returns in the nature of increased public welfare.”

1920s, Authority and Religious Liberty (1924)

"The Energy Crisis — Why Our World Will Never Again Be the Same", in Redbook (1974); later in Progress As If Survival Mattered : A Handbook For A Conserver Society (1977) by Hugh Nash, p. 166
1970s

Speech in Bangor (17 January 1935), quoted in The Times (18 January 1935), p. 7
Later life

Stephen F. Chadwick (1878). Governor Stephen F. Chadwick - Biennial Message, 1878 http://records.sos.state.or.us/ORSOSWebDrawer/Recordpdf/6777836. Oregon State Archives, Oregon Secretary of State. Source: Biennial Message of Gov. S. F. Chadwick, to the Legislative Assembly of the State of Oregon Tenth Regular Session-1878 329 Governor’s Message.

1920s, The Democracy of Sports (1924)

1920s, Address at the Black Hills (1927)

1961, Speech to Special Joint Session of Congress
Context: Finally, if we are to win the battle that is now going on around the world between freedom and tyranny, the dramatic achievements in space which occurred in recent weeks should have made clear to us all, as did the Sputnik in 1957, the impact of this adventure on the minds of men everywhere, who are attempting to make a determination of which road they should take. […] Now it is time to take longer strides — time for a great new American enterprise — time for this nation to take a clearly leading role in space achievement, which in many ways may hold the key to our future on earth. I believe we possess all the resources and talents necessary. But the facts of the matter are that we have never made the national decisions or marshaled the national resources required for such leadership. We have never specified long-range goals on an urgent time schedule, or managed our resources and our time so as to insure theft fulfillment. Recognizing the head start obtained by the Soviets with their large rocket engines, which gives them many months of lead-time, and recognizing the likelihood that they will exploit this lead for some time to come in still more impressive successes, we nevertheless are required to make new efforts on our own. For while we cannot guarantee that we shall one day be first, we can guarantee that any failure to make this effort will make us last. We take an additional risk by making it in full view of the world, but as shown by feat of astronaut Shepard, this very risk enhances our stature when we are successful. But this is not merely a race. Space is open to us now; and our eagerness to share its meaning is not governed by the efforts of others. We go into space because whatever mankind must undertake, free men must fully share.

1920s, Ways to Peace (1926)

Citizenship Convention, Canberra, 23 January, 1950.
Second Term as Prime Minister (1949-1966)
Source: http://www.australianquotes.com/quotes_1950-present.php