Proverbs 17:24

A man of understanding concentrates on wisdom, but a fool lacks concentration. His mind roams everywhere.

"The eyes of the mebin [discerning man] are riveted on the teacher, for he is fascinated by her instruction and is a picture of unbroken concentration. The kesil [fool] has the wandering eye and the vacant distracted mind, and his condition is expressed by a hyperbole. As a student who is hearing nothing of what his teacher says might let his eyes rove to every corner of the classroom, so the fool who is inattentive to the instruction of Wisdom is said to have his eyes on the ends of the earth." [Note: McKane, p. 504.]