“You will keep him in perfect peace,
 Whose mind is stayed on You,
 Because he trusts in You.
 Trust in the LORD forever,
 For in YAH, the LORD, is everlasting strength.”  Isaiah 26:3-4

It is YAH who will keep in perfect peace those whose mind is stayed on Him.  He is the Divine Keeper.  Scripture has much to say of this.  Following are some verses to take heart in when fear disturbs your being:
“The righteous cry out, and the LORD hears,
 And delivers them out of all their troubles.”  Psalm 34:17

“He will not allow your foot to be moved (slip);
 He who keeps you will not slumber.”  Psalm 121:3
(Read all of Psalm 121. I my NKJV study Bible this Psalm is titled, “God Is Our Keeper.)

Peace is a gift:
“The LORD will give strength to His people;
 The LORD will bless His people with Peace.”  Psalm 29:11
(Read all of Psalm 29 and be awed!  It tells of the powerful voice of God!)

There is abundant peace for those who love God’s law:
“Great peace have those who love Your law,
 And nothing causes them to stumble.”  Psalm 119:165

We are in this world, but not of it:  
Jesus told the disciples, during His last discourse with them, that it is HIS peace that He gives them! That peace is for Believers also.
“Peace I leave with you, My Peace I give to you; not as the world gives do I give to you.  Let not your heart be troubled, neither let it be afraid.”  
John 14:27

Then in John 16:33 He tells them,
“These things I have spoken to you, that in Me you may have peace.  In the world you will have tribulation; but be of good cheer, I have overcome he world.”

In Jesus’ prayer to the Father in John 17:11,
“Now I am no longer in the world, but these are in the world, and I come to You.  Holy Father keep through Your name those whom You have given Me, that they may be one as We are.”
(Read that again, let it soak in!  One with the Father, one with the Son and one with the indwelling Holy Spirit!)

“Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ.”  Romans 5:1

Now as we sojourn in the world, we have the promise of this peace that passes understanding:
“Be anxious for nothing, but in everything by prayer and supplication with thanksgiving, let your requests be made known to God;
 and the peace of God that surpasses all understanding, will guard your hearts and mind through Jesus Christ.”  Philippians 4:6-7

Thank you most Holy God for this peace that is ours through our Savior and Lord, Jesus Christ.  How grateful we are knowing that You are in control and we have nothing to fear.  We are Yours!  So we can say with Paul,
“…for I know whom I have believed and am persuaded that He is able to keep what I have committed to Him until that Day.”  2 Timothy 1:12
Amen

So we sing:
“He is our peace,
 Who has broken down every wall
 He is our peace, He is our peace.
 He is our peace,
 Who has broken down every wall
 He is our peace, He is our peace.
 
Cast all your cares on Him
 For He careth for you.
 He is our peace, He is our peace.”