More quotes by Plato

"Knowledge becomes evil if the aim be not virtuous."
"Knowledge which is acquired under compulsion has no hold on the mind. Therefore do not use compulsion, but let early education be a sort of amusement; you will then be better able to discover the child's natural bent."
"Wise men speak because they have something to say; fools because they have to say something."
"Poets utter great and wise things which they do not themselves understand."
"Calligraphy is a geometry of the soul which manifests itself physically."