Source: Modern thinkers and present problems, (1923), p. 37: Chapter 2. Benedict de Spinoza, 1632-1677
“Everything excellent is as difficult as it is rare.”
Source: Ethics
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Baruch Spinoza 210
Dutch philosopher 1632–1677Related quotes

“Needs must it be hard, since it is so seldom found. How would it be possible, if salvation were ready to our hand, and could without great labour be found, that it should be by almost all men neglected? But all things excellent are as difficult as they are rare.”
Et sane arduum debet esse, quod adeo raro reperitur. Qui enim posset fieri, si salus in promptu esset et sine magno labore reperiri posset, ut ab omnibus fere negligeretur? Sed omnia praeclara tam difficilia, quam rara sunt.
Part V, Prop. XLII, Scholium
Ethics (1677)

The Rickover Effect (1992)
Context: The Quakers have an excellent approach to thinking through difficult problems, where a number of intelligent and responsible people must work together. They meet as equals, and anyone who has an idea speaks up. There are no parliamentary procedures and no coercion from the Chair. They continue the discussion until unanimity is reached. I want you guys to do that. Get in a room with no phones and leave orders that you are not to be disturbed. And sit there until you can deal with each other as individuals, not as spokesmen for either organization.

Aphorism 22
Les Caractères (1688), Du mérite personnel
Context: From time to time there appear on the face of the earth men of rare and consummate excellence, who dazzle us by their virtue, and whose outstanding qualities shed a stupendous light. Like those extraordinary stars of whose origins we are ignorant, and of whose fate, once they have vanished, we know even less, such men have neither forebears nor descendants: they are the whole of their race.

“Everything that’s difficult you should be able to laugh about.”
Vulture http://www.vulture.com/2010/06/louis_ck_interview.html

“God didn't create you to be average. You were created to excel You have everything”
Source: Become a Better You: 7 Keys to Improving Your Life Every Day

“Start with the difficult and when it gets easy, everything else is easier.”
Source: The Matchmaker of Kenmare