“If I cannot sing a work, I cannot conduct it.”
Conductors by John L. Holmes (1988) pp 31-37 ISBN 0-575-04088-2
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Thomas Beecham 12
British conductor and impresario 1879–1961Related quotes

“When I cannot sing my heart, I can only speak my mind.”
"Julia" (1968); these lines were adapted from lines of Sand and Foam (1926) by Khalil Gibran: "When life does not find a singer to sing her heart she produces a philosopher to speak her mind."
Lyrics

Conductors by John L. Holmes (1988) pp 256-261 ISBN 0-575-04088-2

“We may bestow advice, but we cannot inspire the conduct.”
Variant translation: We give advice but do not inspire behavior.
Maxim 378.
Reflections; or Sentences and Moral Maxims (1665–1678)

Sonnet XLIII: "What lips my lips have kissed, and where, and why" (1923), Collected Poems", 1931
Context: Thus in the winter stands the lonely tree,
Nor knows what birds have vanished one by one,
Yet knows its boughs more silent than before:
I cannot say what loves have come and gone,
I only know that summer sang in me
A little while, that in me sings no more.

“We cannot avoid or escape, but we can sing.”
As to why the title of the film Bulbul Can Sing has the word sing, and why it matters to the story
Women And Hollywood Article - Under the Radar: Rima Das’ “Bulbul Can Sing” Examines the Joy and Pain of Growing Up - 6 November 2018 https://womenandhollywood.com/under-the-radar-rima-das-bulbul-can-sing-examines-the-joy-and-pain-of-growing-up/ - Archive https://web.archive.org/web/20210728172902/https://womenandhollywood.com/under-the-radar-rima-das-bulbul-can-sing-examines-the-joy-and-pain-of-growing-up/
BULBUL CAN SING Director Q&A | TIFF 2018, at 12 Min 48 Sec https://www.youtube.com/watch?v=DQ4vt8ASzE8
“You cannot learn a new form of conduct without changing yourself.”
Language Education in a Knowledge Context (1980)
Context: It is precisely through one's learning about the total context in which the language of a subject is expressed that personality may be altered. If one learns how to speak history or mathematics or literary criticism, one becomes, by definition, a different person. The point to be stressed is that a subject is a situation in which and through which people conduct themselves, largely in language. You cannot learn a new form of conduct without changing yourself.

The Changeling http://seacoastnh.com/poems/changeling2.html, st. 7 (1879)