Muller is often attributed with a version of this saying, and the quote (with attribution to Muller) appears as early as 1897 in The Churchman https://books.google.com/books?id=cpdOAQAAMAAJ&pg=RA25-PA45&lpg=RA25-PA45&dq=The+beginning+of+anxiety+is+the+end+of+faith,+and+the+beginning+of+true+faith+is+the+end+of+anxiety+%2B+the+churchman&source=bl&ots=3x_wtX82mF&sig=gGHZUKxXWa5BfvRfzeY_F8zA9dM&hl=; however, no source written by Muller can be found to confirm him as having said this.
“At the end of ancient civilization ontic anxiety is predominant, at the end of the Middle Ages moral anxiety, and at the end of the modern period spiritual anxiety.”
Source: The Courage to Be (1952), p.57
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Paul Tillich 61
German-American theologian and philosopher 1886–1965Related quotes
Widely attributed online to Auden, this phrase does not occur anywhere in his writings. It is apparently a confused recollection of the title of his long poem The Age of Anxiety (1947). (The phrase "age of anxiety" occurs only in the title of the poem, not in the text, nor in anything else by Auden.)
Misattributed
“Overt anxiety… that part of anxiety of which the individual is aware and ready to speak.”
Source: The Scientific Analysis of Personality, 1965, p. 372
Source: Outlines of a Philosophy of Art, 1925, p. 41