“A man must be perfectly crazy who, where there is tolerable security, does not employ all the stock which he commands,…”
Source: (1776), Book II, Chapter I, p. 313 (see opportunity cost).
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Adam Smith 175
Scottish moral philosopher and political economist 1723–1790Related quotes

Source: (1776), Book IV, Chapter V, Digression, p. 572.

“He who does not punish evil commands it to be done.”
Chi non punisce il male comanda che si faccia.
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Variant: He who does not punish evil commands it to be done.

Remarks by German Chancellor Angela Merkel before a joint session of Congress on November 04, 2009. http://www.spiegel.de/international/europe/0,1518,659196,00.html
Dokumentation: Angela Merkels Rede im US-Kongress im Wortlaut http://www.welt.de/politik/ausland/article5079678/Angela-Merkels-Rede-im-US-Kongress-im-Wortlaut.html
Context: Even after the end of the Cold War we are […] faced with the task of tearing down the walls between different concepts of life, in other words the walls in people's minds that make it difficult time and again to understand one another in this world of ours. This is why the ability to show tolerance is so important. While, for us, our way of life is the best possible way, others do not necessarily feel that way. There are different ways to create peaceful coexistence. Tolerance means showing respect for other people's history, traditions, religion and cultural identity. But let there be no misunderstanding: Tolerance does not mean "anything goes". There must be zero tolerance towards all those who show no respect for the inalienable rights of the individual and who violate human rights.

“He who offends others, does not secure himself.”
The Notebooks of Leonardo da Vinci (1883), X Studies and Sketches for Pictures and Decorations

“The task we must set for ourselves is not to feel secure, but to be able to tolerate insecurity.”
Source: The Art of Loving

Speech to officer cadets at the Berlin Sportpalast, 18 December 1940. [Hitler: Speeches and Proclamations, 1932-1945 (English Volume III: 1939-1940), Domarus, Max, Max Domarus, Bolchazy-Carducci Publishers, 1997, 2162, 0865166277]
1940s