"Many of those who come to see me have a high standing in the community. Among them are merchants, college graduates, teachers and government officials. Their minds are filled with opinions about things. They are too clever to listen to others. It is like a cup of water. If a cup is filled with stale, dirty water, it is useless. Only after the old water is thrown out can the cup become useful. You must emply your minds of opinions, then you will see. Our practice goes beyond cleverness and stupidity. If you think that you are clever, wealthy, important, and an expert in Buddhism, you cover up the truth of non-self. All you will see is self - I and mine. But Buddhism is letting go of self. Those who are too clever will never learn. They must first get rid of their cleverness, first empty their "cup"." - Ajahn Chah
