We learned to be patient observers like the owl. We learned cleverness from the crow, and courage from the jay, who will attack an owl ten times its size to drive it off its territory. But above all of them ranked the chickadee because of its indomitable spirit. Tom Brown, Jr.
Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all; too much cleverness and too much learning, accompanied with ill bringing-up, are far more fatal. Plato
Ignorance of all things is an evil neither terrible nor excessive, nor yet the greatest of all; but great cleverness and much learning, if they be accompanied by a bad training, are a much greater misfortune. Plato
Never stay up on the barren heights of cleverness, but come down into the green valleys of silliness. Ludwig Wittgenstein
The bold are helpless without cleverness. Euripides