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 ; however, no source written by Muller can be found to confirm him as having said this.
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Be not afraid of life. Believe that life is worth living, and your belief will help create the fact.
Attribution
Quote text and notes from Wikiquote: George Müller (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.