Prophet speaks upon the intelligence of his Ummah!

A group of our people has narrated from Ahmad ibn Muhammad ibn ‘Isa from al-Hassan ibn Ali ibn 
Faddal from certain persons of our people from abu ‘Abdallah who has said the following. 
"The holy Prophet never spoke to people from the height and with the full power of his intelligence. The 
holy Prophet (s.a.) has said, "We the community of the Prophets are commanded to speak to people up 
to the level of their intelligence and understanding."

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Al-Kafi - H 15, Ch. 1, h 15