It all is a matter of faith. If a person has a strong faith, he/she would be perfect. A person with weak faith would not be able to cope with many things. Consequently if you approach a person with weak faith with Sufism you would not attain any results. You should first reinforce their faith with the miracles in the Qur'an, with the facts leading to faith and then you can talk to them about whatever you like. - Harun Yahya