“Civilisation can never sustain itself upon cannibalism of any form. For that by which alone man is true can only be nourished by love and justice.”
Sādhanā : The Realisation of Life http://www.spiritualbee.com/spiritual-book-by-tagore/ (1916)
Context: We never can have a true view of man unless we have a love for him. Civilisation must be judged and prized, not by the amount of power it has developed, but by how much it has evolved and given expression to, by its laws and institutions, the love of humanity. The first question and the last which it has to answer is, Whether and how far it recognises man more as a spirit than a machine? Whenever some ancient civilisation fell into decay and died, it was owing to causes which produced callousness of heart and led to the cheapening of man's worth; when either the state or some powerful group of men began to look upon the people as a mere instrument of their power; when, by compelling weaker races to slavery and trying to keep them down by every means, man struck at the foundation of his greatness, his own love of freedom and fair-play. Civilisation can never sustain itself upon cannibalism of any form. For that by which alone man is true can only be nourished by love and justice.
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Rabindranath Tagore 178
Bengali polymath 1861–1941Related quotes
Source: The Human Form: Sculpture, Prints, and Drawings, 1977, p. 7.

Speech in Boston (2002)
Context: Israel will never get true security and safety through oppressing another people. A true peace can ultimately be built only on justice. We condemn the violence of suicide bombers, and we condemn the corruption of young minds taught hatred; but we also condemn the violence of military incursions in the occupied lands, and the inhumanity that won't let ambulances reach the injured.

“Each people can do justice to itself only if it does justice to others”
1910s, The World Movement (1910)
Context: Each people can do justice to itself only if it does justice to others; but each people can do its part in the world movement for all only if it first does its duty within its own household. The good citizen must be a good citizen of his own country first before he can with advantage be a citizen of the world at large.

Sādhanā : The Realisation of Life http://www.spiritualbee.com/spiritual-book-by-tagore/ (1916)
Context: We never can have a true view of man unless we have a love for him. Civilisation must be judged and prized, not by the amount of power it has developed, but by how much it has evolved and given expression to, by its laws and institutions, the love of humanity. The first question and the last which it has to answer is, Whether and how far it recognises man more as a spirit than a machine? Whenever some ancient civilisation fell into decay and died, it was owing to causes which produced callousness of heart and led to the cheapening of man's worth; when either the state or some powerful group of men began to look upon the people as a mere instrument of their power; when, by compelling weaker races to slavery and trying to keep them down by every means, man struck at the foundation of his greatness, his own love of freedom and fair-play. Civilisation can never sustain itself upon cannibalism of any form. For that by which alone man is true can only be nourished by love and justice.

“Coventry”, pp. 500-501; originally published in Astounding Science Fiction (July 1940)
Short fiction, The Past Through Tomorrow (1967)

Source: The Ascetical Homilies of Saint Isaac the Syrian, p. 428

Source: This and That and the Other (1912), Ch. XXXII : The Barbarians , p. 282
Context: In a word, the Barbarian is discoverable everywhere in this that he cannot make; that he can befog or destroy, but that he cannot sustain; and of every Barbarian in the decline or peril of every civilisation exactly that has been true.
We sit by and watch the Barbarian, we tolerate him; in the long stretches of peace we are not afraid.
We are tickled by his irreverence, his comic inversion of our old certitudes and our fixed creeds refreshes us: we laugh. But as we laugh we are watched by large and awful faces from beyond: and on these faces there is no smile.