“The sincere alone can recognize sincerity. Not a Hero only is needed, but a world fit for him;”
1840s, Heroes and Hero-Worship (1840), The Hero As King
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Thomas Carlyle 481
Scottish philosopher, satirical writer, essayist, historian… 1795–1881Related quotes

Provisions of the Last Will and Testament of Dr. James Rush http://books.google.com/books?id=lSowTqXCyyUC&pg=PA13&dq=%22dreaded+by+the+advocates+of+error%22&hl=en&ei=NCJGTP-fBJ-QnwfB8K2uBA&sa=X&oi=book_result&ct=result&resnum=13&ved=0CGQQ6AEwDA#v=onepage&q=%22dreaded%20by%20the%20advocates%20of%20error%22&f=false
O encontro marcado [A Time to Meet] (1956), trans. John Procter, p. 210

“Be correct, humble and sincere: you will amaze the world.”
Original: (it) Siate corretti, umili e sinceri: stupirete il mondo.
Source: prevale.net

1970's, Conversations with Samuel Beckett and Bram van Velde (1970 - 1972)

“We need some honesty and sincerity instead of corrupt government in Washington.”
As quoted in "Kevorkian Plans Congressional Run" (13 March 2008), Fox News
2000s, 2008

Persecution
One Minute Wisdom (1989)
Context: A disciple was one day recalling how Buddha, Jesus, Mohammed were branded as rebels and heretics by their contemporaries.
Said the Master, Nobody can be said to have attained the pinnacle of Truth until a thousand sincere people have denounced him for blasphemy.

“Sincerity is the way of Heaven. The attainment of sincerity is the way of men.”
The Analects, The Doctrine of the Mean
Context: Sincerity is the way of Heaven. The attainment of sincerity is the way of men. He who possesses sincerity is he who, without an effort, hits what is right, and apprehends, without the exercise of thought — he is the sage who naturally and easily embodies the right way. He who attains to sincerity is he who chooses what is good, and firmly holds it fast. To this attainment there are requisite the extensive study of what is good, accurate inquiry about it, careful reflection on it, the clear discrimination of it, and the earnest practice of it.

Speech delivered at the officers' club (June 16, 1959).
Principles of the 14th July Revolution (1959)