“If you believe that life is worth living then your belief will create the fact.”

"Is Life Worth Living?"
Variant: Believe that life is worth living, and your belief will help create the fact.
Source: 1890s, The Will to Believe and Other Essays in Popular Philosophy (1897)

Knowing Yourself: The True in the False (1996)

Stay Alive All Your Life (1957)
Context: By success, of course, I do not mean that you may become rich, famous, or powerful for that does not, of necessity, represent achievement. Indeed, not infrequently, such individuals represent pathetic failure as persons. By success I mean the development of mature and constructive personality.
Through the application of the principle of constructive thinking you can attain your worthy goals. The natural outcome of living by creative principles is creative results. Believe and create is a basic fact of successful living.

Variant transcription from "Death of a Genius" in Life Magazine: "Certainly there are things worth believing. I believe in the brotherhood of man and the uniqueness of the individual. But if you ask me to prove what I believe, I can't. You know them to be true but you could spend a whole lifetime without being able to prove them. The mind can proceed only so far upon what it knows and can prove. There comes a point where the mind takes a leap—call it intuition or what you will—and comes out upon a higher plane of knowledge, but can never prove how it got there. All great discoveries have involved such a leap."
Unsourced variant: "The intellect has little to do on the road to discovery. There comes a leap in consciousness, call it intuition or what you will, and the solution comes to you and you do not know how or why. All great discoveries are made in this way." The earliest published version of this variant appears to be The Human Side of Scientists by Ralph Edward Oesper (1975), p. 58 http://books.google.com/books?id=-J0cAQAAIAAJ&q=%22solution+comes+to+you+and+you+do+not+know%22&dq=%22solution+comes+to+you+and+you+do+not+know%22&hl=en, but no source is provided, and the similarity to the "Life Magazine" quote above suggests it's likely a misquote.
Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 136

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 91

Edie : Girl On Fire (2006)

'Dao lagaao zindagi pe’ (put a stake on your life), Deendayalji’s article, quoted in L.K. Advani, My Country My Life (2008)