...No longer was there a white market for their savage wares; but therewas still a sufficient incentive for the taking of Numa—alive... 
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... With Taglat there was another incentive—a secretand sinister incentive, which, had Tarzan of the Apes had knowledge ofit, would have sent him at the other's throat in jealous rage...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
...
Affection an incentive, ...
Dinks, Mayhew, and Hutchinson 「The Dog」
...In their relation, he gave everything in the way of incentive andinitiative, and she returned her entire effort loyally...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...This is a higher, nobler,and greater incentive to righteousness than any life of personal rewardor fear of punishment in a future life...
Dr. D.M. Brooks 「The Necessity of Atheism」
...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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