Isaiah 26:3-4 - Rock of Ages

You will keep in perfect peace him whose mind is steadfast, because he trusts in you. Trust in the LORD forever, for the LORD, the LORD, is the Rock eternal.

Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee. Trust ye in the LORD for ever: for in the LORD JEHOVAH is everlasting strength:

Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee. Trust ye in the LORD for ever: for in the LORD JEHOVAH is everlasting strength:

Isaiah 26:3-4

Commentary

A fixed disposition of trust in the Lord brings a peace that the wicked can never know (48:22; 57:21). Such reliance precludes double mindedness (James 1:6-8) and serving two masters (Matt. 6:24).

MacArthur, J. J. (1997, c1997). The MacArthur Study Bible (electronic ed.) (Is 26:3). Nashville: Word Pub.

Rock of Ages

"everlasting strength" in this verse may be translated literally as the expression "the Rock of Ages." It was from this expression that Augustus Toplady got the idea for one of the greatest hymns in the English language, "Rock of Ages" while seeking shelter in a cleft in a rocky crag during a violent thunderstorm.

MacDonald, W., & Farstad, A. (1997, c1995). Believer's Bible Commentary : Old and New Testaments (Is 26:1). Nashville: Thomas Nelson.