“The masterpiece should appear as the flower to the painter—perfect in its bud as in its bloom - with no reason to explain it's presence - no mission to fulfill - a joy to the artist, a delusion to the philanthropist - a puzzle to the botanist - an accident of sentiment and alliteration to the literary man.”

Letter 185 (to Marion M' Naught) Aberdeen , 1837
Letters of Samuel Rutherford (Andrew Bonar)

30 December 1850
Journal Intime (1882), Journal entries
Context: Each bud flowers but once and each flower has but its minute of perfect beauty; so, in the garden of the soul each feeling has, as it were, its flowering instant, its one and only moment of expansive grace and radiant kingship. Each star passes but once in the night through the meridian over our heads and shines there but an instant; so, in the heaven of the mind each thought touches its zenith but once, and in that moment all its brilliancy and all its greatness culminate. Artist, poet, or thinker, if you want to fix and immortalize your ideas or your feelings, seize them at this precise and fleeting moment, for it is their highest point. Before it, you have but vague outlines or dim presentiments of them. After it you will have only weakened reminiscence or powerless regret; that moment is the moment of your ideal.

Source: Dying Earth (1950-1984), The Eyes of the Overworld (1966), Chapter 5, "The Pilgrims"
Source: Tales of the Dying Earth

A Poet!—He Hath Put His Heart to School, l. 9 (1842).

Heretics and Heresies (1874)
Context: By this time the whole world should know that the real Bible has not yet been written, but is being written, and that it will never be finished until the race begins its downward march, or ceases to exist.
The real Bible is not the work of inspired men, nor prophets, nor apostles, nor evangelists, nor of Christs. Every man who finds a fact, adds, as it were, a word to this great book. It is not attested by prophecy, by miracles or signs. It makes no appeal to faith, to ignorance, to credulity or fear. It has no punishment for unbelief, and no reward for hypocrisy. It appeals to man in the name of demonstration. It has nothing to conceal. It has no fear of being read, of being contradicted, of being investigated and understood. It does not pretend to be holy, or sacred; it simply claims to be true. It challenges the scrutiny of all, and implores every reader to verify every line for himself. It is incapable of being blasphemed. This book appeals to all the surroundings of man. Each thing that exists testifies of its perfection. The earth, with its heart of fire and crowns of snow; with its forests and plains, its rocks and seas; with its every wave and cloud; with its every leaf and bud and flower, confirms its every word, and the solemn stars, shining in the infinite abysses, are the eternal witnesses of its truth.

Source: Drive: The Surprising Truth About What Motivates Us

Variant: Each generation must, out of relative obscurity, discover its mission, fulfill it, or betray it.
Source: The Wretched of the Earth