Ephesians 1:2 (KJV) Grace be to you, and peace, from God our Father, and from the Lord Jesus Christ.
This greeting and blessing of grace and peace, that only can come form GOD our Father and our LORD Jesus Christ, was used by Paul and others used in many of the letters to the churches. Here is a list:
Romans 1:7 (KJV) To all that be in Rome, beloved of God, called to be saints: Grace to you and peace from God our Father, and the Lord Jesus Christ.
1 Corinthians 1:3 (KJV) Grace be unto you, and peace, from God our Father, and from the Lord Jesus Christ.
2 Corinthians 1:2 (KJV) Grace be to you and peace from God our Father, and from the Lord Jesus Christ.
Galatians 1:3 (KJV) Grace be to you and peace from God the Father, and from our Lord Jesus Christ,
Philippians 1:2 (KJV) Grace be unto you, and peace, from God our Father, and from the Lord Jesus Christ.
Colossians 1:2 (KJV) To the saints and faithful brethren in Christ which are at Colosse: Grace be unto you, and peace, from God our Father and the Lord Jesus Christ.
1 Thessalonians 1:1 (KJV) Paul, and Silvanus, and Timotheus, unto the church of the Thessalonians which is in God the Father and in the Lord Jesus Christ: Grace be unto you, and peace, from God our Father, and the Lord Jesus Christ.
2 Thessalonians 1:2 (KJV) Grace unto you, and peace, from God our Father and the Lord Jesus Christ.
Philemon 1:3 (KJV) Grace to you, and peace, from God our Father and the Lord Jesus Christ.
2 Peter 1:2 (KJV) Grace and peace be multiplied unto you through the knowledge of God, and of Jesus our Lord,
And when Paul write to Timothy and Titus (who he was disciplining) he added mercy.John did the same in the 2nd epistle:
1 Timothy 1:2 (KJV) Unto Timothy, my own son in the faith: Grace, mercy, and peace, from God our Father and Jesus Christ our Lord.
2 Timothy 1:2 (KJV) To Timothy, my dearly beloved son: Grace, mercy, and peace, from God the Father and Christ Jesus our Lord.
Titus 1:4 (KJV) To Titus, mine own son after the common faith: Grace, mercy, and peace, from God the Father and the Lord Jesus Christ our Saviour.
2 John 1:3 (KJV) Grace be with you, mercy, and peace, from God the Father, and from the Lord Jesus Christ, the Son of the Father, in truth and love.
Grace: G5485 (Strong) χάρις charis khar’-ece
From G5463; graciousness (as gratifying), of manner or act (abstract or concrete; literal, figurative or spiritual; especially the divine influence upon the heart, and its reflection in the life; including gratitude): – acceptable, benefit, favour, gift, grace (-ious), joy liberality, pleasure, thank (-s, -worthy).

Mercy: G1656 (Strong) ἔλεος eleos el’-eh-os
Of uncertain affinity; compassion (human or divine, especially active): – (+ tender) mercy.

Peace: G1515 (Strong) εἰρήνη eirēnē i-rah’-nay
Probably from a primary verb εἴρω eirō (to join); peace (literally or figuratively); by implication prosperity: – one, peace, quietness, rest, + set at one again.

Grace, mercy and peace are not something earned or a reward but a free gift of GOD just like the faith and salvation He has given to us. “Ephesians 2:8-9 (KJV) For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: 9 Not of works, lest any man should boast.”
Let us therefore be thankful of and hold on to the grace, the mercy and peace GOD the Father and Jesus Christ our LORD gives and even multiples to us.
Left us also walk in His grace, mercy and peace binging it to others in the name of Jesus Christ.