'Understanding' in the Bible

For oppression makes a wise man foolish,And a bribe corrupts the [good judgment of the] heart.

I again saw under the sun that the race is not to the swift and the battle is not to the strong, and neither is bread to the wise nor riches to those of intelligence and understanding nor favor to men of ability; but time and chance overtake them all.

Even when a fool walks along the road, his [common] sense and good judgment fail him and he demonstrates to everyone that he is a fool.