Answer: A person is not responsible for anything. If he acts only according to the fact that everything comes from the Creator and he is under His full control, then the Creator is responsible for everything.
But to the extent that a person attributes these thoughts to himself, he is responsible for them.
A person himself determines what he is responsible for and what he isn’t. If you claim that “there is none else beside Him,” based on your inner state, then everything really comes from the Creator. But this is your perspective of life, so you act accordingly.
Question: Is it possible to say that bad thoughts are harmful to a person, while good ones are beneficial?
Answer: I would not say that. We do not know what is bad, and what is good.
From the Kabbalah Lesson in Russian 1/15/17