Psalms 33:17 - Coke's Commentary on the Holy Bible

An horse is a vain thing, &c.— The expression is the same in this and the preceding verse; and therefore the meaning must be the same. After having particularized the stout man and the horse; that is to say, the infantry and cavalry, the strength and the swiftness of an army; and said, that neither of them could save a king; he repeats again what he had said before in general, that no number of forces could do it; pointing out in the next verses, wherein is the true defence, and the only sure dependance of man.