“It's the ciiiiiiiiiiiiircle of liiiiiiiiiife!" Iggy sang”

Jean-Christophe (1904 - 1912), Journey's End: The Burning Bush (1911)
Context: God was not to him the impassive Creator, a Nero from his tower of brass watching the burning of the City to which he himself has set fire. God was fighting. God was suffering. Fighting and suffering with all who fight and for all who suffer. For God was Life, the drop of light fallen into the darkness, spreading out, reaching out, drinking up the night. But the night is limitless, and the Divine struggle will never cease: and none can know how it will end. It was a heroic symphony wherein the very discords clashed together and mingled and grew into a serene whole! Just as the beech-forest in silence furiously wages war, so Life carries war into the eternal peace.
The wars and the peace rang echoing through Christophe. He was like a shell wherein the ocean roars. Epic shouts passed, and trumpet calls, and tempestuous sounds borne upon sovereign rhythms. For in that sonorous soul everything took shape in sound. It sang of light. It sang of darkness, sang of life and death. It sang for those who were victorious in battle. It sang for himself who was conquered and laid low. It sang. All was song. It was nothing but song.

“The woods would be quiet if no bird sang but the one that sang best.”

Henry Van Dyke (1852–1933) American diplomat

The following information is from the following site: http://pt.wikiquote.org/wiki/Talento , the fourth entry, which gives the citation as (( Henry van Dyke quoted in "Handicapped Individuals Services and Training Act: hearing before the Subcommittee on Select Education of the Committee on Education and Labor, House of Representatives, Ninety-seventh Congress, second session, on HR 6820 … hearing held in St. Paul, Minn., and Loretto, Minn. on September 2, 1982. "-. 223 Page, United States. Congress. House. Committee on Education and Labor. Subcommittee on Select Education - USGPO, 1982 - 257 pages ))
Quoted by Tor Dahl in the document cited https://hdl.handle.net/2027/pur1.32754076335276?urlappend=%3Bseq=229.
A very similar quote appears in an essay entitled "Do What You Can" by "Little Home Body" in the The Phrenological Journal and Life Illustrated, Volumes 62-63 (August 1876): "The woods would be very silent if no birds sang there but those that sang best" but states "I know not who said those beautiful words"
However, the quote may have been misattributed to Henry Van Dyke. In "The Two Vocations or the sisters of mercy at home" by Elizabeth Charles (1858) p.34 the following appears: "'Dear Jean', she said,'the woods would be very silent if no bird sang but those that sing best' "
Attributed
Variant: Use what talent you possess: the woods would be very silent if no birds sang except those that sang best.

“Don’t be afraid.”
“I hear voices,” Iggy said. “Be very afraid.”

James Patterson (1947) American author

Source: The Angel Experiment

“Oh, the little birds sang east, and the little birds sang west.”

Elizabeth Barrett Browning (1806–1861) English poet, author

Toll Slowly; reported in Bartlett's Familiar Quotations, 10th ed. (1919).

“They sang as they lifted the children into the ship. They sang old space chanteys and helped the children up the ladder one at a time and into the hands of the sisters. They sang heartily to dispel the fright of the little ones.”

Walter M. Miller, Jr. book A Canticle for Leibowitz

Ch 30
A Canticle for Leibowitz (1959), Fiat Voluntas Tua
Context: They sang as they lifted the children into the ship. They sang old space chanteys and helped the children up the ladder one at a time and into the hands of the sisters. They sang heartily to dispel the fright of the little ones. When the horizon erupted, the singing stopped. They passed the last child into the ship. The horizon came alive with flashes as the monks mounted the ladder. The horizons became a red glow. A distant cloudbank was born where no cloud had been. The monks on the ladder looked away from the flashes. When the flashes were gone, they looked back. The visage of Lucifer mushroomed into hideousness above the cloudbank, rising slowly like some titan climbing to its feet after ages of imprisonment in the Earth.