Jonathan Swift. Travels Lemuel Gulliver (№ 155226)

The highest mental gifts cannot substitute for moral virtues. There is nothing so dangerous as to entrust important positions such talented people. Error committed in ignorance a man full of good intentions, can always be fixed. But the activities of a person with vicious tendencies, endowed with ability to hide their vices with impunity to indulge them, is a great danger for the public good.