...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」
...The incentive to this step was the inhuman treatment he was subjected to...
William Still 「The Underground Railroad」
...During the two hundred and fifty years that the Negro spent inslavery he had little cause or incentive to accumulate money orproperty...
Booker T. Washington 「The Future of the American Negro」
...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」
...Hugo set down my bag, accepted another gold coin; and with a queersidelong smile, the incentive for which I had not the slightest idea,he vanished...
Various 「Astounding Stories of Super-Science September 1930」
...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」
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