“But still try, for who knows what is possible…”
As quoted in The Life and Letters of Faraday (1870) Vol. II, edited by Henry Bence Jones, p. 483; also engraved above the doorways of the Pfahler Hall of Science at Ursinus College in Collegeville, Pennsylvania (see photo http://www.flickr.com/photos/monyca/17917765/in/pool-ursinus/).
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Michael Faraday 30
English scientist 1791–1867Related quotes

“Only when I know who I am will I know what is possible.”
Be Here Now (1971)

Ancient Medicine
Context: Certain s and physicians say that it is not possible for any one to know medicine who does not know what man is, and that who ever would cure men properly, must learn this in the first place. But this saying rather appertains to philosophy, as Empedocles and certain others have described what man in his origin is, and how he first was made and constructed. But I think whatever such has been said or written by sophist or physician concerning nature has less connexion with the art of medicine than with the art of painting. And I think that one cannot know anything certain respecting nature from any other quarter than from medicine... Wherefore it appears to me necessary to every physician to be skilled in nature, and strive to know... what man is in relation to the articles of food and drink, and to his other occupations, and what are the effects of each of them to every one.<!--pp. 174-175
[Grant, Jennifer, MOMumental: Adventures in the Messy Art of Raising a Family, http://books.google.com/books?id=8Iu1QtZR_X8C&pg=PT184, 1 May 2012, Worthy Publishing, 978-1-61795-099-5, 184–]

Songs of the Soul by Paramahansa Yogananda, Quotes drawn from the poem "What is Love?"

Supposedly said during an interview with Fox News http://archive.newsmax.com/archives/articles/2006/7/5/00548.shtml
Disputed

“I'm still figuring out who I am. But at least I know what I want.”
InStyle magazine (2009)