“And above all, watch with glittering eyes the whole world around you because the greatest secrets are always hidden in the most unlikely places. Those who don't believe in magic will never find it.”

Edie : Girl On Fire (2006)
Context: But I really, since I exist, at all, I believe that it's possible for people... I've lived through impossible situations. So I believe in it. I just believe, and that's the magic... That's the whole thing, you talk about magic that there's to believe in, and it is there. But most people don't really believe in it. And I refuse, like, since I'm still alive and done the things I've done and seen things and understood things as far as I have, and I am alive, I mean physically intact. When I shouldn't be, according to medical reports and so forth. I mean I should be, not here. That's all there is to it. So the magic's working and it's a rare situation.

Source: The Female Eunuch

Blood Meridian (1985)
Source: Blood Meridian, or the Evening Redness in the West
Context: The judge tilted his great head. The man who believes that the secrets of this world are forever hidden lives in mystery and fear. Superstition will drag him down. The rain will erode the deeds of his life. But that man who sets himself the task of singling out the thread of order from the tapestry will by the decision alone have taken charge of the world and it is only by such taking charge that he will effect a way to dictate the terms of his own fate.

Source: My Most Excellent Year

Variant: Keep trying, hold on, and always, always, always believe in yourself, because if you don't, then who will?

http://www.washingtonpost.com/wp-dyn/articles/A46503-2004Aug30.html
New York City

Original: (it) ​Il segreto per risolvere un problema sta sempre nel trovare la strada più adatta: rifletti, prova, non arrenderti, sii costante ed otterrai.
Source: prevale.net