“Rarely do we arrive at the summit of truth without running into extremes; we have frequently to exhaust the part of error, and even of folly, before we work our way up to the noble goal of tranquil wisdom.”
Prefatory Remarks
The Philosophical Letters
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Friedrich Schiller 111
German poet, philosopher, historian, and playwright 1759–1805Related quotes

Letter to John Jay (15 August 1786) http://gwpapers.virginia.edu/documents/constitution/1784/jay2.html
1780s
Context: If you tell the Legislatures they have violated the treaty of peace and invaded the prerogatives of the confederacy they will laugh in your face. What then is to be done? Things cannot go on in the same train forever. It is much to be feared, as you observe, that the better kind of people being disgusted with the circumstances will have their minds prepared for any revolution whatever. We are apt to run from one extreme into another. To anticipate & prevent disasterous contingencies would be the part of wisdom & patriotism.
What astonishing changes a few years are capable of producing! I am told that even respectable characters speak of a monarchical form of government without horror. From thinking proceeds speaking, thence to acting is often but a single step. But how irrevocable & tremendous! What a triumph for the advocates of despotism to find that we are incapable of governing ourselves, and that systems founded on the basis of equal liberty are merely ideal & falacious! Would to God that wise measures may be taken in time to avert the consequences we have but too much reason to apprehend.
Retired as I am from the world, I frankly acknowledge I cannot feel myself an unconcerned spectator. Yet having happily assisted in bringing the ship into port & having been fairly discharged; it is not my business to embark again on a sea of troubles. Nor could it be expected that my sentiments and opinions would have much weight on the minds of my Countrymen — they have been neglected, tho' given as a last legacy in the most solemn manner. I had then perhaps some claims to public attention. I consider myself as having none at present.

Bk. 1, ch. 4. Translated by Robert B. Burke, in: Edward Grant (1974) Source Book in Medieval Science. Harvard University Press. p. 93
Opus Majus, c. 1267

1920s, The Reign of Law (1925)
Think Better: An Innovator's Guide to Productive Thinking

Masaru Ibuka cited in: Ashley Goldsworthy (2009), Leadership in Action. p. 52

“Folly will run its course and it is the part of wisdom not to take it too seriously.”
Source: Aphorisms and Reflections (1901), p. 216

Die Wahrheit widerspricht unserer Natur, der Irrthum nicht, und zwar aus einem sehr einfachen Grunde: die Wahrheit fordert, daß wir uns für beschränkt erkennen follen, der Irrthum schmeichelt uns. wir seien auf ein- oder die andere Weise unbegränzt.
Maxim 310, trans. Stopp
Maxims and Reflections (1833)

http://www.vote-smart.org/speech_detail.php?speech_id=55399 (June 15, 2004).

President Serzh Sargsyan participated at the solemn event dedicated to the 20th anniversary of the Republican Party of Armenia (RPA) http://www.president.am/events/news/eng/?pn=4&id=1366 (December 18, 2010)