2 Open ye the gates, that the righteous nation which keepeth the truth may enter in.
3 Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee.
4 Trust ye in the LORD for ever: for in the LORD JEHOVAH is everlasting strength:
(Isaiah 26:2-4, King James Version)
Isaiah 26:3 is perhaps one of the most familiar verses in the Bible when we think of the word "peace." Often Old Testament passages have more than one application. In verse 2, Isaiah is talking about the nation of Israel, however he is also speaking of the righteous nation made up of believers from the beginning to the end of time. They are the only ones who will be allowed to enter into the new heavens and the new earth.
What characteristic is present in all Christians? Perfect Peace! Thou wilt keep him in perfect peace whose mind is stayed on Thee. There is a qualification besides being a believer, however, that we need to exercise while still in our earthly bodies: our minds must be stayed upon Christ! We can never know perfect peace while still on this earth, but we will have perfect peace when Christ comes back again. Does that mean that we should not strive for peace? Of course not. Isaiah is telling us that the only way to peace is through the Lord Jesus Christ.
Now, look at verse 4.
Trust ye in the LORD for ever: for in the LORD JEHOVAH is everlasting strength.
Not only can we have perfect peace through the Lord Jesus Christ, we also receive everlasting strength from Him as well.
You know, often I read through these verses without much thought of the depth of their meaning. In reality, no matter how hard we try, we just cannot perceive the glories that await us in heaven. We really do not understand perfect peace and everlasting strength, as neither is possible for us in life as we know it.
That reminds me of the first verse from the hymn, "Jerusalem the Golden".
Jerusalem the golden,
With milk and honey blest,
Beneath thy contemplation
Sink heart and voice oppressed.
I know not, O I know not,
What joys await us there;
What radiancy of glory,
What bliss beyond compare.
Carry this thought with you as you go about the duties of this day:
Thou wilt keep Him in perfect peace, whose mind is stayed on Thee. KJV
God Bless You,