Allan Kardec. The book of spirits (№ 396589)

Question: Geniuses and just smart people, do they always get their ideas to themselves?
Answer: Sometimes the ideas belong to their own spirit, but they are often suggested to them by other spirits who consider them capable of understanding and worthy to convey these ideas to others. When these people do not find ideas in themselves, they appeal to inspiration; thus they, at all without knowing it, make the summoning of spirits.