“It is modest of the nightingale not to require anyone to listen to it; but it is also proud of the nightingale not to care whether any one listens to it or not.”
Source: The Present Age
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Sören Kierkegaard 309
Danish philosopher and theologian, founder of Existentialism 1813–1855Related quotes

“Were I a nightingale, I would act the part of a nightingale; were I a swan, the part of a swan.”
Book I, ch. 16.
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Life of Agesilaus II
Bartlett's Familiar Quotations, 10th ed. (1919)

“There is no competition of sounds between a nightingale and a violin.”
Dancing of Sounds http://www.poetrysoup.com/famous/poem/21378/Dancing_of_Sounds
From the poems written in English
Song Morning Please Don't Come.

The First Quarrel, stanza VI., lines 3-4; reported in Bartlett's Familiar Quotations, 10th ed. (1919)

“A nightingale dies for shame if another bird sings better.”
Section 2, member 3, subsection 6.
The Anatomy of Melancholy (1621), Part I

Bianca Among the Nightingales http://www.poemhunter.com/p/m/poem.asp?poet=3035&poem=127031, st. 1 (1862).