Fyodor Dostoyevsky said this quote
“ Note for a moment do I take you for a truth that is real,' Ivan exclaimed in what even amounted to fury. 'You are a falsehood, you are my illness, you are a ghost. Only I do not know how to destroy you, and perceive that for a certain time I must suffer you. You are a hallucination I am having. You are the embodiment of myself, but only of one side of me ... of my thoughts and emotions, though only those that are most loathsome and stupid. In that regard you might even be of interest to me, if only I had time to throw away on you ... ”