“No doubt Jack the Ripper excused himself on the grounds that it was human nature.”
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A.A. Milne 169
British author 1882–1956Related quotes
"Purely Personal Prejudices" http://books.google.com/books?id=DLcEAQAAIAAJ&q=%22A+person+who+is+going+to+commit+an+inhuman+act+invariably+excuses+himself++to+himself+by+saying+I'm+only+human+after+all%22&pg=PA232#v=onepage
Strictly Personal (1953)

Source: Sexual Personae: Art and Decadence from Nefertiti to Emily Dickinson (1990), p. 247

Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.1 (1884 edition) http://books.google.com/books?id=1Z9DGVKfXuQC p. 28
Context: The whole analogy of natural operations furnishes so complete and crushing an argument against the intervention of any but what are termed secondary causes, in the production of all the phenomena of the universe; that, in view of the intimate relations between Man and the rest of the living world; and between the forces exerted by the latter and all other forces, I can see no excuse for doubting that all are co-ordinated terms of Nature's great progression, from the formless to the formed—from the inorganic to the organic—from blind force to conscious intellect and will.

Klee's statement written in 1923, in 'Paths of the Study of Natura' (Wage dar Natur studiums), Paul Klee; in Yearbook of the Staatlich. Bauhaus, Weimar, 1919-1923, Bauhaus Verlag, Weimar, 1923
1921 - 1930

1960s, Review of Teilhard de Chardin's "The Phenomenon of Man", 1961

“Nature has no compassion. Nature accepts no excuses and the only punishment it knows is death.”
Section 36
Reflections on the Human Condition (1973)