Quote two lines in Chapter 19 spoken by Renfield which suggest that Dracula has a profound influence on his thoughts and the words he speaks.
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I'm actually taking this from chapter 18 which seems to fit your question better,
"Let me entreat you, Dr. Seward, oh, let me implore you, to let me out of this house at once. Send me away how you will and where you will, send keepers with me with whips and chains, let them take me in a strait waistcoat, manacled and leg-ironed, even to gaol, but let me go out of this. You don't know what you do by keeping me here. I am speaking from the depths of my heart, of my very soul. You don't know whom you wrong, or how, and I may not tell. Woe is me! I may not tell. By all you hold sacred, by all you hold dear, by your love that is lost, by your hope that lives, for the sake of the Almighty, take me out of this and save my soul from guilt! Can't you hear me, man? Can't you understand? Will you never learn? Don't you know that I am sane and earnest now, that I am no lunatic in a mad fit, but a sane man fighting for his soul? Oh, hear me! Hear me! Let me go, let me go, let me go!"