A person who has been plagued by doubts and whispers since he began praying; what is your guidance?

Question:
He says that since he began praying, he has been troubled by doubts and the whispers of Satan, and he nearly loses his mind from the sheer number of these whispers. He notes that, as he says, before he started praying, he was not troubled by such whispers. Please guide him. May Allah reward you with good.

Answer:
These whispers do not harm him in any way, and praise be to Allah, because this is Satan. The Prophet (peace and blessings be upon him) said: And when a man asked the Prophet (peace and blessings be upon him) about finding things in his mind, such as falling from a mountain, but not thinking about them, the Prophet (peace and blessings be upon him) said: "Praise be to Allah, this is the sign of faith," or he said (peace and blessings be upon him): "That is the sign of faith." He said (peace and blessings be upon him): So these do not harm a person, and praise be to Allah. They are the whispers and illusions that come to him while he is praying or after the prayer. A person rejects them firmly and does not pay any attention to them at all. He seeks refuge in Allah from the accursed Satan, and they do not harm him, if Allah wills. They will go away from him by the permission of Allah. However, if he interacts with them or pays attention to them, they will increase upon him. Perhaps they will increase, and Satan will gain power over him. So he should not pay any attention to them at all, not look at them, not speak about them, and not excuse them. There is nothing wrong. Yes, may Allah reward you with good. As for comparing his state before prayer and after prayer, he should not compare his state before prayer and after prayer. He should praise Allah, maintain his prayers, and leave these comparisons, these whispers, and these matters that may stir up many doubts and worries in him. Yes, may Allah reward you with good.