“The next question was — what makes planets go around the sun? At the time of Kepler some people answered this problem by saying that there were angels behind them beating their wings and pushing the planets around an orbit. As you will see, the answer is not very far from the truth. The only difference is that the angels sit in a different direction and their wings push inward.”
Source: The Character of Physical Law (1965), chapter 1, “The Law of Gravitation,” p. 18: video http://www.youtube.com/watch?v=j3mhkYbznBk&t=17m10s
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Richard Feynman 181
American theoretical physicist 1918–1988Related quotes

“A beautiful and ineffectual angel, beating in the void his luminous wings in vain.”
On Percy Bysshe Shelley, Byron
Essays in Criticism, second series (1888)

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Speech https://api.parliament.uk/historic-hansard/commons/1855/feb/23/supply-ministerial-explanations to the House of Commons (23 February 1855) opposing the Crimean War.
1850s
Context: The angel of death has been abroad throughout the land; you may almost hear the beating of his wings. There is no one, as when the first-born were slain of old, to sprinkle with blood the lintel and the two sideposts of our doors, that he may spare and pass on; he takes his victims from the castle of the noble, the mansion of the wealthy, and the cottage of the poor and the lowly, and it is on behalf of all these classes that I make this solemn appeal.

“To equip a dull, respectable person with wings would be but to make a parody of an angel.”
Crabbed Age and Youth.
Virginibus Puerisque and Other Papers (1881)
Context: All error, not merely verbal, is a strong way of stating that the current truth is incomplete. The follies of youth have a basis in sound reason, just as much as the embarrassing questions put by babes and sucklings. Their most antisocial acts indicate the defects of our society. When the torrent sweeps the man against a boulder, you must expect him to scream, and you need not be surprised if the scream is sometimes a theory. Shelley, chafing at the Church of England, discovered the cure of all evils in universal atheism. Generous lads irritated at the injustices of society, see nothing for it but the abolishment of everything and Kingdom Come of anarchy. Shelley was a young fool; so are these cocksparrow revolutionaries. But it is better to be a fool than to be dead. It is better to emit a scream in the shape of a theory than to be entirely insensible to the jars and incongruities of life and take everything as it comes in a forlorn stupidity. Some people swallow the universe like a pill; they travel on through the world, like smiling images pushed from behind. For God’s sake give me the young man who has brains enough to make a fool of himself! As for the others, the irony of facts shall take it out of their hands, and make fools of them in downright earnest, ere the farce be over. There shall be such a mopping and a mowing at the last day, and such blushing and confusion of countenance for all those who have been wise in their own esteem, and have not learnt the rough lessons that youth hands on to age. If we are indeed here to perfect and complete our own natures, and grow larger, stronger, and more sympathetic against some nobler career in the future, we had all best bestir ourselves to the utmost while we have the time. To equip a dull, respectable person with wings would be but to make a parody of an angel.

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2010s, 2018