He also reported God’s messenger as saying, “People will continue to ask one another questions till someone says this, ‘God created all things, but who created God?’ Whoever comes across anything of that nature should say, ‘I believe in God and in His messengers.’ ”
He also reported God’s messenger as saying, “The devil comes to one of you saying, ‘Who created this? Who created that?’ even saying, ‘Who created your Lord?’ "When he gets that length the man should seek refuge in God and stop thinking about it.”
Ibn Mas'ud reported God's messenger as saying, “There is none of you who does not have his partner from among the jinn and his partner from among the angels put in charge of him.” The hearers asked, “Does this also apply to you, messenger of God?” He replied, “It applies to me too, but God has helped me against him and he has accepted Islam, so he commands me to do only what is good.”
He said that some of the companions of God’s messenger came to the Prophet to consult him saying, “We have thoughts which none of us dare to talk about.” He said, “Have you experienced that?” and when they replied that they had, he said, “That is clear faith.”