“Vital is the relation between earthly sorrow and eternal satisfaction. The travail to which God's saints are subjected results in the birth of nobler natures and more sanctified spirits. Pain always promotes progress, and suffering invariably ensures success.”

"The Problems of the Colored Race in the South," lecture, Hamilton Club, Chicago (10 December 1895) http://web.archive.org/20071031084051/www.historycooperative.org/btw/Vol.4/html/93.html
Context: Men may make laws to hinder and fetter the ballot, but men cannot make laws that will bind or retard the growth of manhood.
We went into slavery a piece of property; we came out American citizens. We went into slavery pagans; we came out Christians. We went into slavery without a language; we came out speaking the proud Anglo-Saxon tongue. We went into slavery with slave chains clanking about our wrists; we came out with the American ballot in our hands.
Progress, progress is the law of nature; under God it shall be our eternal guiding star.

Precious Remedies Against Satan's Devices, 1652

The Golden Violet - Amenaïde
The Golden Violet (1827)

1951 - 1968, The Creative Act', 1957

Complete Works of Swami Vivekananda, Calcutta, 1985, Volume VI, p. 85. Quoted from Goel, S. R. (1996). History of Hindu-Christian encounters, AD 304 to 1996. Chapter 13 ISBN 9788185990354

Le succès, qui ne prouve pas toujours le mérite, tient souvent davantage au choix du sujet qu’à son exécution.
Editor's Preface. Trans. P.W.K. Stone (1961). http://fr.wikisource.org/wiki/Les_Liaisons_dangereuses_-_Pr%C3%A9face_du_r%C3%A9dacteur
This preface was written by Choderlos de Laclos in the guise of an editor.
Les liaisons dangereuses (1782)

Source: For White Hill (1995), p. 257

Source: Love and Will (1969), Ch. 13 : Communion of Consciousness, p. 320
Context: Creativity is the result of a struggle between vitality and form. As anyone who has tried to write a sonnet or scan poetry, is aware, the form ideally do not take away from the creativity but may add to it.

On her dark night of spiritual desolation amidst devotion, in a letter addressed to Jesus, as quoted in Mother Teresa: Come Be My Light (2007) edited by Father Brian Kolodiejchuk, p. 192; regarding this quote, Fr. Kolodiejchuk writes: "...when addressing Jesus — that is, in prayer — she could express herself with ease. Fufilling her confessor's request, she sent to him a letter addressed to Jesus, enclosing it with her letter dated September 3, 1959." https://books.google.com/books?id=P4cqT0nK_joC&pg=PA192&dq=%22when+addressing+Jesus+-+that+is,+in+prayer+-+she+could+express+herself+%22&hl=en&sa=X&ved=0ahUKEwjk0IOm5vTOAhVF1x4KHYdRDE4Q6AEIHDAA#v=onepage&q=%22when%20addressing%20Jesus%20-%20that%20is%2C%20in%20prayer%20-%20she%20could%20express%20herself%20%22&f=false
1950s
Context: My own Jesus,
They say people in hell suffer eternal pain because of the loss of God – they would go through all that suffering if they had just a little hope of possessing God. In my soul I feel just that terrible pain of loss, of God not wanting me, of God not being God, of God not really existing (Jesus, please forgive my blasphemies, I have been told to write everything). That darkness that surrounds me on all sides. I can’t lift my soul to God – no light or inspiration enters my soul. I speak of love for souls, of tender love for God, words pass through my words sic, lips], and I long with a deep longing to believe in them! What do I labour for? If there be no God—there can be no soul.—If there is no soul then Jesus—You also are not true... Jesus don't let my soul be deceived—nor let me deceive anyone. In the call You said that I would have to suffer much.—Ten years—my Jesus, You have done to me according to Your will—and Jesus hear my prayer—if this pleases You—if my pain and suffering—my darkness and separation gives You a drop of consolation—my own Jesus, do with me as You wish—as long as You wish, without a single glance at my feelings and pain... I beg of You only one thing—please do not take the trouble to return soon.—I am ready to wait for You for all eternity.