...it's true; but what kind of a long novel would it be if thehero had no incentive... 
Various 「Astounding Stories, August, 1931」
...The single candle, which barely lights up the dark shade that fills the corners of my room, is but a poor incentive to cheerfulness...
Henry M. Stanley 「How I Found Livingstone」
... And how is he to do itwith ten, fifteen, or twenty years' imprisonment before him? Thehope of liberty and of opportunity is the only incentive to life,especially the prisoner's life...
Emma Goldman 「Anarchism and Other Essays」
...Not justice, but social injustice isthe incentive of these worthy gentlemen...
Various 「Mother Earth, Vol. 1 No. 1, March 1906」
...in New York, for instance, even in my own Time would have beenmerely an incentive to reconstruct upon a greater scale...
Various 「Astounding Stories, July, 1931」
...The problem as thus presented was one of the most difficult we canperceive of, but the difficulty was only an incentive to attacking itwith all the greater energy...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...Oppression gives a spring to the soul; it obliges man to examine closely into the cause of his sorrows; misfortune is a powerful incentive, that turns the mind to the side of truth...
Paul Henri Thiery (Baron D'Holbach) Samuel Wilkinson 「The System of Nature, Volume 2」
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strides effusions lovely
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