A horse is a vain thing for safety - Even the horse, with all his fleetness, is no sure means of escape from danger: the lion or the tiger can overtake him or he may stumble, fall, and destroy his rider.
An horse - The reference here is undoubtedly to the war-horse. See the notes at Psalm 20:7.
Is a vain thing - literally, is a “lie.” That is, he cannot be confided in.
For safety - For securing safety in battle. He is liable to be stricken down, or to become wild and furious so as to be beyond the control of his rider; and however strong or fleet he may be, or however well he may be “broken,” yet none of these things make it certain that the rider will be safe. God is the only being in whom perfect confidence can be reposed.
Neither shall he deliver any by his great strength - Safety cannot be found in his mere “strength,” however great that may be. These illustrations are all designed to lead the mind to the great idea that safety is to be found in God alone, Psalm 33:18-19.
And throughout the songs of David the thought was impressed on his people that Jehovah was their strength and deliverer: PP 716.1
The kingdom of Israel had now reached in extent the fulfillment of the promise given to Abraham, and afterward repeated to Moses: “Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates.” Genesis 15:18. Israel had become a mighty nation, respected and feared by surrounding peoples. In his own realm David's power had become very great. He commanded, as few sovereigns in any age have been able to command, the affections and allegiance of his people. He had honored God, and God was now honoring him. PP 716.5
But in the midst of prosperity lurked danger. In the time of his greatest outward triumph David was in the greatest peril, and met his most humiliating defeat. PP 716.6
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