A wise man is strong - His wisdom enables him to construct a great variety of machines, by which, under his own influence, he can do the labor of a hundred or even a thousand men. But in all cases wisdom gives power and influence; and he who is wise to salvation can overcome even Satan himself. The Septuagint has: "The wise is better than the strong; and the man who has prudence, than a stout husbandman."
Is strong - literally, as in the margin; i. e., rooted and established in strength.