Al-Farabi
Skill is established in you only by repeating its actions many times. Repeat bad writing and bad writing is what takes hold; repeat excellent writing and you get that instead.
Al-FarabiWhen first observed, the stupid person has the form of an intelligent person, and his intention is a sound intention. Frequently, his deliberation lands him in evil, even though he was not aiming to fall into it.
Al-Farabi