Allah says in a verse from the Koran "They ask you (O Muhammad ) concerning the Spirit. Say; the Spirit it is one of the things, the knowledge of which is only with my Lord. And of knowledge, you (mankind) have been given only a little.(Al-Isra 15/ 85)". When the polytheists and the Jews asked our Prophet (pbuh) about the spirit, he replied them as follows: "Its knowledge is only with Allah; it is the divine wisdom of Allah in humans".