Albert Schweitzer: Man

This has usually been presented as something "said shortly before his death" without any definite source, but appears to be entirely spurious. The "FAQ about the life and thoughts of Albert Schweitzer" http://www.schweitzer.org/faq?lang=en#rasist asserts "This quote is utterly false and is an outrageously inaccurate picture of Dr. Schweitzer’s view of Africans. Dr. Schweitzer never said or wrote anything remotely like this. It does NOT appear in the book African Notebook." This refers to some citations of it being from Afrikanische Geschichten (1938), which was translated as From My African Notebook (1939) by Mrs. C. E. B Russell
Misattributed

Sometimes presented in paraphrased form, such as "Example is not the main thing in influencing others, it is the only thing" https://books.google.com/books?id=5Za7o6teOHoC&pg=PR18&dq=%22example+is+not+the+main+thing%22+schweitzer&hl=en&sa=X&ved=0ahUKEwjFh4m9vqvMAhUG02MKHRqZDtsQ6AEIMzAE#v=onepage&q=%22example%20is%20not%20the%20main%20thing%22%20&f=false.
God's Own Man (1952)

Variant translation: Until he extends his circle of compassion to include all living things, man will not himself find peace.
Variant translation: Until we extend the circle of compassion to all living things, we will not ourselves find peace.
Kulturphilosophie (1923)

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics
Context: A man is really ethical only when he obeys the constraint laid on him to help all life which he is able to succor, and when he goes out of his way to avoid injuring anything living. He does not ask how far this or that life deserves sympathy as valuable in itself, nor how far it is capable of feeling. To him life as such is sacred. He shatters no ice crystal that sparkles in the sun, tears no leaf from its tree, breaks off no flower, and is careful not to crush any insect as he walks. If he works by lamplight on a summer evening, he prefers to keep the window shut and to breathe stifling air, rather than to see insect after insect fall on his table with singed and sinking wings.
If he goes out in to the street after a rainstorm and sees a worm which has strayed there, he reflects that it will certainly dry up in the sunshine, if it does not quickly regain the damp soil into which it can creep, and so he helps it back from the deadly paving stones into the lush grass. Should he pass by an insect which has fallen into a pool, he spares the time to reach it a leaf or stalk on which it may clamber and save itself.

Memoirs of Childhood and Youth (1924)
Variant: A great secret of success is to go through life as a man who never gets used up.
Context: The great secret of success is to go through life as a man who never gets used up. That is possible for him who never argues and strives with men and facts, but in all experience retires upon himself, and looks for the ultimate cause of things in himself.

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics
Context: I must interpret the life about me as I interpret the life that is my own. My life is full of meaning to me. The life around me must be full of significance to itself. If I am to expect others to respect my life, then I must respect the other life I see, however strange it may be to mine. And not only other human life, but all kinds of life: life above mine, if there be such life; life below mine, as I know it to exist. Ethics in our Western world has hitherto been largely limited to the relations of man to man. But that is a limited ethics. We need a boundless ethics which will include the animals also.

Source: The Spiritual Life (1947), p. 267
Context: The ethic of reverence for life constrains all, in whatever walk of life they may find themselves, to busy themselves intimately with all the human and vital processes which are being played out around them, and to give themselves as men to the man who needs human help and sympathy. It does not allow the scholar to live for his science alone, even if he is very useful to the community in so doing. It does not permit the artist to exist only for his art, even if he gives inspiration to many by its means. It refuses to let the business man imagine that he fulfills all legitimate demands in the course of his business activities. It demands from all that they should sacrifice a portion of their own lives for others. In what way and in what measure this is his duty, this everyone must decide on the basis of the thoughts which arise in himself, and the circumstances which attend the course of his own life. The self-sacrifice of one may not be particularly in evidence. He carries it out simply by continuing his normal life. Another is called to some striking self-surrender which obliges him to set on one side all regard for his own progress. Let no one measure himself by his conclusions respecting someone else. The destiny of men has to fulfill itself in a thousand ways, so that goodness may be actualized. What every individual has to contribute remains his own secret. But we must all mutually share in the knowledge that our existence only attains its true value when we have experienced in ourselves the truth of the declaration: 'He who loses his life shall find it.

Source: The Spiritual Life (1947), p. 269
Context: To the man who is truly ethical all life is sacred, including that which from the human point of view seems lower in the scale. He makes distinctions only as each case comes before him, and under the pressure of necessity, as, for example, when it falls to him to decide which of two lives he must sacrifice in order to preserve the other. But all through this series of decisions he is conscious of acting on subjective grounds and arbitrarily, and knows that he bears the responsibility for the life which is sacrificed.

Variant : The thinking man must oppose all cruel customs no matter how deeply rooted in tradition and surrounded by a halo. When we have a choice, we must avoid bringing torment and injury into the life of another, even the lowliest creature; to do so is to renounce our manhood and shoulder a guilt which nothing justifies.
As quoted in Becoming Vegan : The Complete Guide to Adopting a Healthy Plant-based Diet (2000) by Brenda Davis and Vesanto Melina, p. 261
Source: The Spiritual Life (1947), p. 305; also in The Animal World of Albert Schweitzer (1950), p. 179

Source: The Spiritual Life (1947), p. 248

Reverence for Life (1969)

Preface, p. vi
Indian Thought And Its Development (1936)

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics

Source: The Quest of the Historical Jesus (1906), p. 4

Source: Out of My Life and Thought : An Autobiography (1933), Ch. 13, p. 188
Context: The great fault of all ethics hitherto has been that they believed themselves to have to deal only with the relations of man to man. In reality, however, the question is what is his attitude to the world and all life that comes within his reach. A man is ethical only when life, as such, is sacred to him, and that of plants and animals as that of his fellow men, and when he devotes himself helpfully to all life that is in need of help. Only the universal ethic of the feeling of responsibility in an ever-widening sphere for all that lives — only that ethic can be founded in thought. … The ethic of Reverence for Life, therefore, comprehends within itself everything that can be described as love, devotion, and sympathy whether in suffering, joy, or effort.

This quote was attributed to Albert Schweitzer by Rachel Carson on p. 17 of her seminal work Silent Spring (1962), and is widely cited on various Internet websites, but an actual source from Schweitzer’s works is elusive.
Disputed