The following general definition of an animal: a system of different organic molecules that have combined with one another, under the impulsion of a sensation similar to an obtuse and muffled sense of touch given to them by the creator of matter as a whole, until each one of them has found the most suitable position for its shape and comfort.
— Denis Diderot

A child-like man is not a man whose development has been arrested; on the contrary, he is a man who has given himself a chance of continuing to develop long after most adults have muffled themselves in the cocoon of middle-aged habit and convention.
Aldous Huxley muffled quote

In the dark colony of night, when I consider man's magnificent capacity for malice, madness, folly, envy, rage, and destructiveness, and I wonder whether we shall not end up as breakfast for newts and polyps, I seem to hear the muffled cries of all the words in all the books with covers closed.
— Leo Rosten

A superb tenor voice, like a silver trumpet muffled in silk.
— Alec Guinness

To the solemn graves, near a lonely cemetery, my heart like a muffled drum is beating funeral marches.
— muffled quotation by Charles Baudelaire