“And let the peace of Christ rule in your hearts, to which indeed you were called in one body.  And be thankful.”  Colossians 3:15

Scripture tells the believer that both Jew and gentile are now one in Christ, and we have the peace of Christ.
“For He Himself is our peace, who has made both one, and has broken down the middle wall of division between us.”  Ephesians 2:14  
(Read Vs. 14-18 for your better understanding.)

‘you were called’
Scripture gives us many references concerning the call of believers (saints).  I will state a few of the verses and encourage you to seek out more.

“I therefore, the prisoner of the Lord, beseech you to have a walk worthy of the calling with which you were called with all lowliness and gentleness, with longsuffering, bearing with one another in love.”  Ephesians 4:1-2

“Therefore do not be ashamed of the testimony of our Lord, nor of me His prisoner, but share with me in the sufferings for the gospel according to the power of God,
who has saved us and called us with a holy calling, not according to our works, but according to His own purpose and grace which was given to us in Christ Jesus before time began.”  
2 Timothy 1:8-9

“Therefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our confession, Christ Jesus.”  Hebrews 3:1

“But the God of all grace, who called us to His eternal glory by Christ Jesus, 
After you have suffered a while, perfect, establish, strengthen, and settle you.
To Him be the glory and dominion forever and ever.  Amen” 1 Peter 5:10-11

“Therefore, brethren, be even more diligent to make your call and election sure, for if you do these things you will never stumble.”  2 Peter 1:10

‘one body’ (the church, the body of Christ)
Here again Scripture has many verses concerning the church/the body of Christ, but I will mention a few.
“So we, being many, are one body in Christ, and individually members of one another.”  Romans 12:5

“Now you are the body of Christ, and members individually.” 
! Corinthians 12:27

“And He (God the Father) put all things under His (Jesus) feet, and gave Him to be head over all things to the church, 
which is His body, the fullness of Him who fills all in all.”  
Ephesians 1:22-23 

The apostle Paul to the Colossians:
“I now rejoice in my sufferings for you, and fill up in my flesh what is lacking in the afflictions of Christ, for the sake of His body which is the church.”  1:24

‘be thankful’
Psalm 100:4,
“Enter into His gates with thanksgiving,
And His courts with praise.
Be thankful to Him, and bless His name.”

“Oh, that men would give thanks to the LORD for His goodness,
And for His wonderful works to the children of men!
Let them sacrifice the sacrifices of thanksgiving,
And declare His works with rejoicing.”  Psalm 107:21-22

“Giving thanks to the Father who has qualified us to be partakers of the inheritance of the saints in the light”  Colossians 1:12

“In everything give thanks, for this is the will of God in Christ Jesus for you.”
1 Thessalonians 5:18

Oh Lord God: Father, Son and Holy Spirit we sing to You:

"Your grace has no measure
Your mercy no end
Your love has no boundaries known unto me,
For out of Your infinite riches in Jesus 
You giveth and You giveth and You giveth again!"

"You are our everything You are our all!
You are our everything both great and small!
You gave Your life for me (us)
Made everything new!
You are our everything none other will do!"
Amen