It+is+impossible+to+say+how+first+the+idea+entered+my+brain;+but+once+conceived,+it+haunted+me+day+and+night.

The Tell-Tale Heart
 * It is impossible to say how first the idea entered my brain; but once conceived, it haunted me day and night.**

In this part of the story, the servant tells us when he got his idea but he does not tell us why. I think that is why he is mad. He tells us in the story about how he is not mad but this proves it. He just wants to kill the old man and he does not know how the idea came to him. He says after this that he liked the old man but he still wants to kill him. That is why he is crazy. It is just an eye that he is freaking out about, a lot of people have disabilities but that is no reason to kill someone.

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