The Quran mentions the story of Moses and Khidr [a prophet mentioned in the Quran who guided Moses on a revelatory journey], a famous story, in which Moses represents sort of the external understanding of the religion and Khidr represents the inner spiritual understanding of the religion. Moses went on a journey with Khidr and Khidr said, "I will not accept you unless you stop questioning things," which from an external point of view seems strange, but inwardly is very meaningful. This is exactly the question of spiritual guidance.
Seyyed Hossein NasrIn fact many Hindu yogis and Sufis met, they became friends, they spoke about the knowledge and love of God; about all the similarities that exist. And then the simplicity of Islam, the fact these people practiced what they preached brought many, many Hindus into Islam.
Seyyed Hossein NasrIf you have a billion Muslims, 900 million of them were not brought into Islam by any kind of invasion, but most of them through the Sufis, because human beings are such that they are affected by people of spiritual character. Certainly when they display nobility and hospitality and gentility and love and are not selfish or aggressive, and they are honest.
Seyyed Hossein NasrIn fact, the machine doesn't have the consciousness we have, the free will that we have, and to surrender one's free will, not in every matter but in spiritual matters, to a spiritual teacher is in a sense a lower level of surrendering one's will to God.
Seyyed Hossein Nasr