Thought is not essential to existence nor its cause, but it is an instrument for becoming; I become what I see in myself. All that thought suggests to me, I can do; all that thought reveals in me, I can become. This should be man's unshakable faith in himself , because God dwells in him.
One must not admit bad thoughts into oneself under the pretext that they are merely thoughts. They are tools of execution. And one should not allow them to exist in oneself if one doesn't want them to do their work of destruction.