An horse; though he be strong, Job 39:19, &c., and fit for battle, Proverbs 21:31; or for flight, if need requires. And so this is put for all warlike provisions; of which horses were and are a very considerable part. A vain thing, Heb. a lie, because it promiseth that help and safety which it cannot give.
Related Commentaries of Psalms 33:17
Psalms 33:17
17 An horse is a vain thing for safety: neither shall he deliver any by his great strength.