“But truth acquired by thinking of our own is like a natural limb; it alone really belongs to us.”
Vol. 2, Ch. 22, § 261
Parerga and Paralipomena (1851), Counsels and Maxims
Context: Truth that has been merely learned is like an artificial limb, a false tooth, a waxen nose; at best, like a nose made out of another's flesh; it adheres to us only because it is put on. But truth acquired by thinking of our own is like a natural limb; it alone really belongs to us. This is the fundamental difference between the thinker and the mere man of learning. The intellectual attainments of a man who thinks for himself resemble a fine painting, where the light and shade are correct, the tone sustained, the colour perfectly harmonised; it is true to life. On the other hand, the intellectual attainments of the mere man of learning are like a large palette, full of all sorts of colours, which at most are systematically arranged, but devoid of harmony, connection and meaning.
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Arthur Schopenhauer 261
German philosopher 1788–1860Related quotes
Source: Personal Destinies: A Philosophy of Ethical Individualism (1976), p. 8

Reflections on Various Subjects (1665–1678), VII. On Air and Manner

Twilight of the Idols (1888)
Context: How is freedom measured, in individuals as in nations? By the resistance which must be overcome, by the effort [Mühe] it costs to remain on top. The highest type of free men should be sought where the highest resistance is constantly overcome: five steps from tyranny, close to the threshold of the danger of servitude. This is true psychologically if by "tyrants" are meant inexorable and dreadful instincts that provoke the maximum of authority and discipline against themselves — most beautiful type: Julius Caesar —; this is true politically too; one need only go through history. The nations which were worth something, became worth something, never became so under liberal institutions: it was great danger that made something of them that merits respect. Danger alone acquaints us with our own resources, our virtues, our armor and weapons, our spirit — and forces us to be strong...

"Saul Bellow: Treading on the Toes of the Brahmans," interview with Lawrence Grobel in Endangered Species: Writers Talk about Their Craft, Their Visions, Their Lives [Da Capo, 2001, ISBN ISBN 0-306-81004-2], p. 21
General sources

As quoted in "Dutch cabinet intensifies security after Paris attacks" http://news.xinhuanet.com/english/2015-11/14/c_134816626.htm, Xinhua News Agency (14 November 2015)
2010s