“The great problem with poisoning by Bitterness was that the passions — hatred, love, despair, enthusiasm, curiosity — also ceased to manifest themselves.”

"The Wet Dream Film Festival" (1971), p. 57
The Madwoman's Underclothes (1986)

Source: Works of Samuel Johnson

Books, Spiritual Warrior, Volume III: Solace for the Heart in Difficult Times (Hari-Nama Press, 2000)

Lecture at Yale University, "Chemical Achievement and Hope for the Future." (October 1947) Published in Science in Progress. Sixth Series. Ed. George A. Baitsell. 100-21, (1949).
1940s-1960s
Context: Science cannot be stopped. Man will gather knowledge no matter what the consequences – and we cannot predict what they will be. Science will go on — whether we are pessimistic, or are optimistic, as I am. I know that great, interesting, and valuable discoveries can be made and will be made… But I know also that still more interesting discoveries will be made that I have not the imagination to describe — and I am awaiting them, full of curiosity and enthusiasm.

Source: Culture and Anarchy (1869), Ch. I, Sweetness and Light
Context: The pursuit of perfection, then, is the pursuit of sweetness and light. He who works for sweetness and light, works to make reason and the will of God prevail. He who works for machinery, he who works for hatred, works only for confusion. Culture looks beyond machinery, culture hates hatred; culture has one great passion, the passion for sweetness and light.

Source: Tender Is the Night

Lord Mhoram, The Power That Preserves

Book IV, line 637 (reported in Bartlett's Familiar Quotations)
Compare: "What's one man's poison, signor, / Is another's meat or drink", Beaumont and Fletcher, Love's Cure (1647), Act III, scene 2
De Rerum Natura (On the Nature of Things)