“I believe that the man choosing progress can find a new unity through the full development of all his human forces, which are produced in three orientations. These can be presented separately or together: biophilia, love for humanity and nature, and independence and freedom.”

Source: In Xenophon's Cyrus the Great: The Arts of Leadership and War https://books.google.com/books?id=w-WNO_TOgOQC&dq=Xenophon%27s%20Cyrus%20the%20Great%3A%20The%20Arts%20of%20Leadership%20and%20War&hl=fr&source=gbs_book_other_versions (2006) p. 116, also quoted in "9 Timeless Leadership Lessons from Cyrus the Great" http://www.forbes.com/sites/ryanholiday/2012/04/19/9-timeless-leadership-lessons-from-cyrus-the-great/ at Forbes.com (19 April 2012)

[Peface de la Histoire de France, Michelet, Jules, Flammarion, 1893-1894, VIII]
History of France, 1833-1867

Source: Humanity Comes of Age, A study of Individual and World Fulfillment (1950), Introduction p. I - XII

May Peace & Happiness Prevail (2004)

Address before the Indian Council of World Affairs, New Delhi, India, April 5, 1956, as quoted in Walter P Reuther: Selected Papers (1961), by Henry M. Christman, p. 135
1950s, Address before the Indian Council on World Affairs (1956)

Credo (1965)

Source: The Next Development in Man (1948), p. 224

Credo (1901)
Context: I believe in the Motherhood of God.
I believe in the Blessed Trinity of Father, Mother and Child.
I believe that God is here, and that we are as near Him now as ever we shall be.
I do not believe He started this world a-going and went away and left it to run by itself.
I believe in the sacredness of the human body, this transient dwelling place of a living soul, And so I deem it the duty of every man and every woman to keep his or her body beautiful through right thinking and right living.
I believe that the love of man for woman, and the love of woman for man is holy; And that this love in all its promptings is as much an emanation of the Divine Spirit as man's love for God, or the most daring hazards of the human mind.
I believe in salvation through economic, social, and spiritual freedom.
I believe John Ruskin, William Morris, Henry Thoreau, Walt Whitman, and Leo Tolstoy to be Prophets of God, who should rank in mental reach and spiritual insight with Elijah, Hosea, Ezekiel, and Isaiah.
I believe that men are inspired to-day as much as ever men were.
I believe we are now living in Eternity as much as ever we shall.
I believe that the best way to prepare for a Future Life is to be kind, live one day at a time, and do the work you can do best, doing it as well as you can.
I believe we should remember the Week-day, to keep it holy.
I believe there is no devil but fear.
I believe that no one can harm you but yourself.
I believe in my own divinity — and yours.
I believe that we are all sons of God, and it doth not yet appear what we shall be.
I believe the only way we can reach the Kingdom of Heaven is to have the Kingdom of Heaven in our hearts.
I believe in every man minding his own business.
I believe in sunshine, fresh air, friendship, calm sleep, beautiful thoughts.
I believe in the paradox of success through failure.
I believe in the purifying process of sorrow, and I believe that death is a manifestation of life.
I believe the Universe is planned for good.
I believe it is possible that I shall make other creeds, and change this one, or add to it, from time to time, as new light may come to me.

The portion of this statement, "Love is the only sane and satisfactory answer to the problem of human existence" has been widely quoted alone, resulting in a less reserved expression, and sometimes the portion following it has been as well: "Any society which excludes, relatively, the development of love, must in the long run perish of its own contradiction with the basic necessities of human nature."
The Art of Loving (1956)
Context: Our society is run by a managerial bureaucracy, by professional politicians; people are motivated by mass suggestion, their aim is producing more and consuming more, as purposes in themselves. All activities are subordinated to economic goals, means have become ends; man is an automaton — well fed, well clad, but without any ultimate concern for that which is his peculiarly human quality and function. If man is to be able to love, he must be put in his supreme place. The economic machine must serve him, rather than he serve it. He must be enabled to share experience, to share work, rather than, at best, share in profits. Society must be organized in such a way that man's social, loving nature is not separated from his social existence, but becomes one with it. If it is true, as I have tried to show, that love is the only sane and satisfactory answer to the problem of human existence, then any society which excludes, relatively, the development of love, must in the long run perish of its own contradiction with the basic necessities of human nature. <!-- p. 111 - 112