“If you still have to ask, shame on you”

— Louis Armstrong

Armstrong's response to the question what jazz is, cited by Max Jones et. al.: "Salute to Satchmo", I.P.C. Specialist & Professional Press Ltd 1970, page 25
Often misquoted as "Man, if you gotta ask you'll never know." Oxford Dictionary of Modern Quotations (third edition)

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Louis Armstrong 12

American jazz trumpeter, composer and singer 1901–1971

Julie Garwood (1946) American writer

Source: Honor's Splendour

“To ask may be but a moment's shame, not to ask and remain ignorant is a lifelong shame.”

Kanō Jigorō (1860–1938) Japanese educator and judoka

This is quoted in several published books as a Japanese proverb, without any mention of Jigoro Kano as author.
Misattributed

“Shame on me, shame on you,
Shame on them, shame on us,
Shame on me, shame on you,
Shame on them, shame on us,
So what the fuss.”

Stevie Wonder (1950) American musician

So What The Fuss
Song lyrics, A Time To Love (2005)

“If they ask you to stand still, you should dance.”

Colum McCann book Let the Great World Spin

Source: Let the Great World Spin

“It covers your shame, keeps you from shivering.
Grass and water are the food it asks.
Who taught you, priest-man,
to feed this breathing thing to your thing of stone?”

Lalleshwari (1320–1392) Indian writer, mystic and saint

The Poems of Lal Ded, poem 59, p. 15
Poetry

“Stop this war! Shame on you Hobbits! Shame on you! This is a fictitious war! This Lord was not elected by the popular”

Michael Moore (1954) American filmmaker, author, social critic, and liberal activist

a computer-generated Oliphaunt steps on Moore, crushing him
In a humorous sendup of Moore's previous acceptance speech for Best Documentary Feature at the 2003 Oscars. Moore himself delivered the lines in the opening act of the 2004 Oscars, while standing in front of a greenscreen which had the Battle of the Pelennor Fields scene from The Lord of the Rings: The Return of the King playing on it; a battle which was, itself, literally fictitious. (23 March 2004)
2004