Wisdom is before [the face of] him that hath understanding. The idea is that the intelligent man directs his look towards Wisdom, and therefore she beams upon him with all her light; as the Vulgate puts it, "In the face of the prudent wisdom shines."
He has one object to which he directs all his attention (Proverbs 15:14). The Septuagint rendering is not so satisfactory: "The countenance of a prudent man is wise;" he shows in his look and bearing the wisdom that guides him.
Thus Ecclesiastes 8:1, "A man's wisdom maketh his face to shine, and the hardness of his face is changed." The eyes of a fool are in the ends of the earth. A fool has no one definite object in view; he pursues a hundred different things, as they happen to come in his way, but misses the most important quest of all and fritters away the powers which might have aided him to obtain wisdom.