“Moreover, the act of birth is the first experience of anxiety, and thus the source and prototype of the affect of anxiety.”
The Interpretation of Dreams (1900), in a footnote Freud added to the Second Edition in 1909 (see Psychoanalytic Pioneers, p. 46 http://books.google.com/books?id=Fro5MZry5FcC&lpg=PP1&pg=PA46#v=onepage&q&f=false.)
1900s
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Sigmund Freud 147
Austrian neurologist known as the founding father of psycho… 1856–1939Related quotes

Source: The Causation and Treatment of Psychopathic Diseases (1916), p. 33

“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

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.