“No one knows what he can do till he tries.”
Maxim 786
Sentences, The Moral Sayings of Publius Syrus, a Roman Slave
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Publilio Siro 112
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Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 377.

Song lyrics, Highway 61 Revisited (1965), Positively 4th Street

1880s, 1880, Letter to Theo (Cuesmes, July 1880)
Context: There is a great difference between one idler and another idler. There is someone who is an idler out of laziness and lack of character, owing to the baseness of his nature. If you like, you may take me for one of those. Then there is the other kind of idler, the idler despite himself, who is inwardly consumed by a great longing for action who does nothing because his hands are tied, because he is, so to speak, imprisoned somewhere, because he lacks what he needs to be productive, because disastrous circumstances have brought him forcibly to this end. Such a one does not always know what he can do, but he nevertheless instinctively feels, I am good for something! My existence is not without reason! I know that I could be a quite a different person! How can I be of use, how can I be of service? There is something inside me, but what can it be? He is quite another idler. If you like you may take me for one of those.

“He never knows whether they want him for what he can do for them now — or will do for them later.”
"Frank Sinatra Has a Cold" (Esquire, April 1966)

"Sometime they'll give a war and nobody will come."
"The People, Yes" (1936)