“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."
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John Lennon 228
English singer and songwriter 1940–1980Related quotes

“Although I cannot move and I have to speak through a computer, in my mind I am free.”
Source: Sigan Ŭn Hangsang Mirae Ro Hŭrŭnŭnʼga: Hokʻing Paksa Ŭi Chaemi Innŭn Chʻoesin Ujuron

“If my mind can conceive it; and my heart can believe it — then I can achieve it.”
Similar to a quote by Jesse Jackson, which is in turn a modification of a quote by Napoleon Hill: "Whatever the mind of man can conceive and believe, it can achieve."
Misattributed
Source: The Soul of a Butterfly: Reflections on Life's Journey

“In my heart I know the truth, but my mind cannot accept the reality of what this all means.”
Source: First They Killed My Father: A Daughter of Cambodia Remembers

“When I hear of anyone walking into a lab and walking out with animals, my heart sings.”
"To Market, To Market," Los Angeles Times Magazine, 1992 March 22.
On animal research and activism against it

“When Life does not find a singer to sing her heart she produces a philosopher to speak her mind.”
Sand and Foam (1926)

“His rhythm is the only one I can sing my songs to.”
On Chuck Berry, http://www.washingtonpost.com/wp-srv/style/longterm/movies/videos/chuckberryhailhailrocknrollpgharrington_a0aa6d.htm
Song lyrics, Others

“I still have the passion in my heart. If I don’t sing, my heart doesn’t beat so strong...”
On singing in "Julio Iglesias says 50-year singing career is 'a miracle'" https://www.reuters.com/article/us-people-julio-iglesias/julio-iglesias-says-50-year-singing-career-is-a-miracle-idUSKCN1T60WU in Reuters (2019 Jun 5)