"You can lead a horticulture but you can't make her think."
Meaning: Humourous quotation attributed to Dorothy Parker.
Origin: She is supposed to have coined this after challenged to use the word "horticulture" in a sentence. Obviously it's a play on words on the familiar "you can lead a horse to water but you can't make it drink" and is spoken as you can lead a whore to culture, but you can't make her think.
Learning is fun. :)