“Cowardice is the most terrible of vices.”
Source: The Master and Margarita
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Mikhail Bulgakov 63
Russian author primarily known for his novel "Master and Ma… 1891–1940Related quotes

“If it is true that cowardice is the most grave vice, then the dog, at least, is not guilty of it.”
Book Two in 'Time to Go! Time to Go!', B/O, here Woland is speaking to the Master about Pontius Pilate
Source: The Master and Margarita (1967)
Context: They have read your novel... and they said only one thing, that, unfortunately, it is not finished. So I wanted to show you your hero. He has been sitting here for about two thousand years, sleeping, but, when the moon is full, he is tormented, as you see, by insomnia. And it torments not only him, but his faithful guardian, the dog. If it is true that cowardice is the most grave vice, then the dog, at least, is not guilty of it. The only thing that brave creature ever feared was thunderstorms. But what can be done, the one who loves must share the fate of the one who is loved.

“Humor is the most engaging cowardice.”
Letter http://books.google.com/books?id=R8ksAAAAIAAJ&q=%22I+own+any+form+of+humor+shows+fear+and+inferiority+Irony+is+simply+a+kind+of+guardedness+So+is+a+twinkle+It+keeps+the+reader+from+criticism%22+%22Humor+is+the+most+engaging+cowardice%22&pg=PA166#v=onepage to Louis Untermeyer (10 March 1924)
General sources
Context: I own any form of humor shows fear and inferiority. Irony is simply a kind of guardedness. So is a twinkle. It keeps the reader from criticism. Whittier, when he shows any style at all is probably a greater person than Longfellow as he is lifted priestlike above consideration of the scornful. Belief is better than anything else, and it is best when rapt, above paying its respects to anybody's doubt whatsoever. At bottom the world isn't a joke. We only joke about it to avoid an issue with someone to let someone know that we know he's there with his questions: to disarm him by seeming to have heard and done justice to this side of the standing argument. Humor is the most engaging cowardice.

“Our virtues are most frequently but vices in disguise.”
Nos vertus ne sont, le plus souvent, que de vices déguisés.
Epigraph. Note: "This epigraph, which is the key to the system of La Rochefoucauld, is found in another form as No. 179 of the Maxims of the first edition, 1665; it is omitted from the second and third, and reappears for the first time in the fourth edition at the head of the Reflections". Aime Martin, editor, Bartlett's Quotations, 1919 edition.
Reflections; or Sentences and Moral Maxims (1665–1678)

“Money is the source of the greatest vice, & that Nation which is most rich, is most wicked.”
The Early Journals and Letters of Fanny Burney, vol. 1, p. 48, journal entry, November 17, 1768.
Letters

“Love--the most wonderful and most terrible thing in the world.”
Source: Gabriela, Clavo y Canela

“Self-pity, he said, is the most demoralizing of all vices.”
Source: Friday (1982), Chapter 24 (p. 244)

“To be lost in spiritlessness is the most terrible thing of all.”

“Ivan Ilych's life had been most simple and most ordinary and therefore most terrible.”
Source: The Death of Ivan Ilyich (1886), Ch. II
Source: The Death of Ivan Ilyich and Other Stories

“The most terrible iron is not missiles, aircraft, and tanks, but shackles.”
Source: https://twitter.com/kyivindependent/status/1562384096130736128