“He that sings a lasting song
Thinks in a marrow-bone.”

Source: Dead Poets Society

quoted in Geoffrey Hindley, The Larousse Encyclopedia of Music (1982) ISBN 0896731014

4
Nets to Catch the Wind (1921), Wild Peaches
Context: Down to the Puritan marrow of my bones
There’s something in this richness that I hate.
I love the look, austere, immaculate,
Of landscapes drawn in pearly monotones.
There’s something in my very blood that owns
Bare hills, cold silver on a sky of slate,
A thread of water, churned to milky spate
Streaming through slanted pastures fenced with stones.

The quote has been misattributed to Maya Angelou at times, including on U.S. postage.
This quote by Joan Walsh Anglund (1967 in her book, A Cup of Sun) has been widely used by Maya Angelou without attribution to Walsh Walsh Anglund, and wrongly misattributed to Maya Angelou many, many times, including on U.S. postage. However, the quote belongs to Joan Walsh Anglund, and is from her book "A Cup of Sun" published in 1967. However, Maya Angelou changed the pronoun "He" to "It" but quoted everything else of Joan Walsh Anglund. Why Maya Angelou never attributed her most famous quote as being Joan Walsh Anglund's is still a mystery to this day.
Source: A Cup of Sun: A Book of Poems (1967)

A Man From Lebanon: Nineteen Centuries Afterward
Jesus, The Son of Man (1928)
Context: You laughed for the marrow in their bones that was not yet ready for laughter;
And you wept for their eyes that yet were dry.
Your voice fathered their thoughts and their understanding.
Your voice mothered their words and their breath.

"The Marrow," ll. 23-24
The Far Field (1964)

As quoted in Woody Guthrie: A Life (1981) by Joe Klein, p. 160
Context: Woody is just Woody. Thousands of people do not know he has any other name. He is just a voice and a guitar. He sings the songs of a people and I suspect that he is, in a way, that people. Harsh voiced and nasal, his guitar hanging like a tire iron on a rusty rim, there is nothing sweet about Woody, and there is nothing sweet about the songs he sings. But there is something more important for those who will listen. There is the will of the people to endure and fight against oppression. I think we call this the American spirit.

"Home-Thoughts, from Abroad", line 14.
Dramatic Romances and Lyrics (1845)