He’s very clever, but sometimes his brains go to his head. Margot Asquith (on F E Smith)
Patience and tenacity of purpose are worth more than twice their weight in cleverness. T H Huxley
The height of cleverness is to be able to conceal it. Francois duc de La Rochefoucauld
An ounce of loyalty is worth a pound of cleverness. Elbert G Hubbard
Cleverness is serviceable for everything, sufficient for nothing. Henri Frederic Amiel
Never stay up on the barren heights of cleverness, but come down into the green valleys of silliness. Ludwig Wittgenstein
Man usually avoids attributing cleverness to somebody else unless it is an enemy. Albert Einstein
Cleverness is not wisdom. Euripides
A man likes his wife to be just clever enough to appreciate his cleverness, and just stupid enough to admire it. Israel Zangwill
Only in Britain could it be thought a defect to be ‘too clever by half’. The probability is that too many people are too stupid by three-quarters. John Major