“It is true if you believe it to be true.”

1840s, Essays: First Series (1841), Self-Reliance
Context: I read the other day some verses written by an eminent painter which were original and not conventional. The soul always hears an admonition in such lines, let the subject be what it may. The sentiment they instil is of more value than any thought they may contain. To believe your own thought, to believe that what is true for you in your private heart is true for all men, — that is genius. Speak your latent conviction, and it shall be the universal sense; for the inmost in due time becomes the outmost, — and our first thought is rendered back to us by the trumpets of the Last Judgment.

Ron English's Fauxlosophy (2016)

Loving What Is: Four Questions That Can Change Your Life (2002)

Source: Half Asleep in Frog Pajamas

Ron English's Fauxlosophy (2016)

Loving What Is: Four Questions That Can Change Your Life (2002)

Source: Wizard's First Rule

Source: Dolly: My Life and Other Unfinished Business

Quotes from Bill Maher show website, quotes of the show, Google searches showing poor results before February 4th (pages which were updated since their original, pre-feb. 4th posting date).
Why would-be engineers end up as English majors, May 21, 2011 http://www.cnn.com/2011/US/05/17/education.stem.graduation/index.html,
Skeptic Blog: "Reality Check", April 20, 2011 http://www.skepticblog.org/2011/04/20/reality-check/,
Google Search for quote prior to Feb. 4th, only results are from pages which were updated after the "posted" date https://www.google.com/search?q=%22The+good+thing+about+science+is+that+it%E2%80%99s+true+whether+or+not+you+believe+in+it.%22&rls=org.mozilla%3Aen-US%3Aofficial&sa=X&ei=m8AwU9KKNc_8oASnhYCoAg&ved=0CBoQpwUoBjgU&source=lnt&tbs=cdr%3A1%2Ccd_min%3A1%2F1%2F2000%2Ccd_max%3A2%2F3%2F2011&tbm=,
2010s