“One does not always sing out of happiness.”

Merchant Gúðmúnsen
Brekkukotsannáll (The Fish Can Sing) (1957)

On what she hopes for her audience in “CELIA CRUZ: AT THE TOP OF SALSA” https://www.nytimes.com/1985/11/19/arts/celia-cruz-at-the-top-of-salsa.html in New York Times (1985 Nov 19).

Source: The Nicomachean Ethics

Car en mon cuer porte couvertement
Le dueil qui soit qui plus me puet desplaire,
Et si me fault, pour les gens faire taire,
Rire en plorant et très amerement
De triste cuer chanter joyeusement.
Rondeau "De triste cuer chanter joyeusement", line 8; Maurice Roy (ed.) Œuvres Poétiques de Christine de Pisan (1886) vol. 1, p. 154, as translated by http://www.brindin.com/pfpistri.htm by Sheenagh Pugh.

As quoted in Treasury of Spiritual Wisdom : A Collection of 10, 000 Powerful Quotations (2003) by Andy Zubko, p. 71

XI, 26, Parts of this passage has been heavily compared with later statements of René Descartes; in Latin and with a variant translations:
The City of God (early 400s)
Context: We both are, and know that we are, and delight in our being, and our knowledge of it. Moreover, in these three things no true-seeming illusion disturbs us; for we do not come into contact with these by some bodily sense, as we perceive the things outside of us of all which sensible objects it is the images resembling them, but not themselves which we perceive in the mind and hold in the memory, and which excite us to desire the objects. But, without any delusive representation of images or phantasms, I am most certain that I am, and that I know and delight in this. In respect of these truths, I am not at all afraid of the arguments of the Academicians, who say, What if you are deceived? For if I am deceived, I am. For he who is not, cannot be deceived; and if I am deceived, by this same token I am. And since I am if I am deceived, how am I deceived in believing that I am? for it is certain that I am if I am deceived. Since, therefore, I, the person deceived, should be, even if I were deceived, certainly I am not deceived in this knowledge that I am. And, consequently, neither am I deceived in knowing that I know. For, as I know that I am, so I know this also, that I know. And when I love these two things, I add to them a certain third thing, namely, my love, which is of equal moment. For neither am I deceived in this, that I love, since in those things which I love I am not deceived; though even if these were false, it would still be true that I loved false things. For how could I justly be blamed and prohibited from loving false things, if it were false that I loved them? But, since they are true and real, who doubts that when they are loved, the love of them is itself true and real? Further, as there is no one who does not wish to be happy, so there is no one who does not wish [themself] to be [into being]. For how can he be happy, if he is nothing?

Esoteric Encyclopedia of Eternal Knowledge

Source: 1840s, Narrative of the Life of Frederick Douglass, An American Slave (1845), Ch. 2
Context: I have often been utterly astonished, since I came to the north, to find persons who could speak of the singing, among slaves, as evidence of their contentment and happiness. It is impossible to conceive of a greater mistake. Slaves sing most when they are most unhappy. The songs of the slave represent the sorrows of his heart; and he is relieved by them, only as an aching heart is relieved by its tears. At least, such is my experience. I have often sung to drown my sorrow, but seldom to express my happiness. Crying for joy, and singing for joy, were alike uncommon to me while in the jaws of slavery. The singing of a man cast away upon a desolate island might be as appropriately considered as evidence of contentment and happiness, as the singing of a slave; the songs of the one and of the other are prompted by the same emotion.

Toronto Star (11/11/2010) commenting on her first seven studio albums.