1, intelligence: indicates intelligence and wisdom.
2, smart: describe something that has something in common with human wisdom, some spirituality and some vitality.
Second, the usage is different.
1, intelligence: people handle the relationship between things and society well.
2, smart: used to show that people have good ideas and correct logic, generally used to praise.
Third, the sources are different.
1, Intelligence: From the second act of Cao Yu's Sword of the Brave, "In her bright eyes, intelligence and majesty shine."
2, smart: from "Xunzi Persuasion" "The eyes can't see, the ears can't listen." (translation: the eyes can't see clearly two things that are not put together at the same time; The ear can't hear two sounds from different directions at the same time. )