“Oh, I must keep my heart inviolate
Against the potent poison of your hate.”

Variant: i carry your heart with me(i carry it in my heart)
Source: Selected Poems

Ô mes petites amoureuses,
Que je vous hais !
Poésies (1871), "Mes petites amoureuses"

"National Brotherhood Week"
That Was the Year That Was (1965)

Arrowsmith (1925)
Context: Perhaps I am a crank, Martin. There are many who hate me. There are plots against me—oh, you t'ink I imagine it, but you shall see! I make many mistakes. But one thing I keep always pure: the religion of a scientist.
To be a scientist—it is not just a different job, so that a man should choose between being a scientist and being an explorer or a bond-salesman or a physician or a king or a farmer. It is a tangle of ver-y obscure emotions, like mysticism, or wanting to write poetry; it makes its victim all different from the good normal man. The normal man, he does not care much what he does except that he should eat and sleep and make love. But the scientist is intensely religious—he is so religious that he will not accept quarter-truths, because they are an insult to his faith.
He wants that everything should be subject to inexorable laws. He is equal opposed to the capitalists who t'ink their silly money-grabbing is a system, and to liberals who t'ink man is not a fighting animal; he takes both the American booster and the European aristocrat, and he ignores all their blithering. Ignores it! All of it! He hates the preachers who talk their fables, but he iss not too kindly to the anthropologists and historians who can only make guesses, yet they have the nerf to call themselves scientists! Oh, yes, he is a man that all nice good-natured people should naturally hate! ~ Gottlieb, Ch. 26

As quoted by Paul Johnson in Failure of the Feminists http://www.spectator.co.uk/features/6766663/failure-of-the-feminists/, The Spectator, 12 March, 2011.
Attributed

Canto III
The Troubadour (1825)

Responding to a suggestion that he return to Hollywood to work on a script of Tender is the Night in a letter to his agent (10 January 1935)
Quoted, Letters