“…Grace to you and peace from God our Father and from the Lord Jesus Christ.”  Romans 1:7

This is part of all the Apostle Paul’s opening greetings in his epistles to the saints.  Besides grace and peace, he often adds mercy.
He closes all of his epistles with a statement such as the following:
“…The grace of the Lord Jesus be with you.”  Romans 16:20
“The grace of the Lord Jesus Christ be with your spirit.”  Philippians 4:23
Or, “Grace be with you all.”  Titus 3:15

Divine grace: unmerited favor, unearned, spiritual blessing; freely given.

Paul speaks much of grace in his letters.  He was the murderous breathing Saul who became the great Apostle Paul by the manifold grace of God.  He speaks experientially (personal experience) because he KNOWS God’s grace.

Colossians 1:6 NIV translation says,
“All over the world the gospel is bearing fruit and growing, just as it has been doing among you since the day you heard it and understood God’s grace in all its truth.”
The Amplified Bible includes in Colossians 1:6
“…[You came to know the grace or undeserved favor of God in reality, deeply and clearly and thoroughly, becoming accurately and intimately acquainted with it.]”

It is God's grace, bestowed in Christ Jesus, that we can and are filled with the knowledge of His will as we see in Colossians 1:9-10,
“For this reason, since the day we heard about you, we have not stopped  praying for you and asking God to fill you with the knowledge of His will through all spiritual wisdom and understanding…in order that you may live a life worthy of the Lord and may please Him in every way…”
(Read all of Paul’s prayer, Vs. 9-12)

Concerning grace:
It is given freely!  You cannot earn it!
“…The Lord gives grace and glory:
 No good thing does He withhold from those who walk uprightly.”  
 Psalm 84:11

Grace empowers men for service:
“According to the grace of God which was given to me, as a wise master builder I laid a foundation and another is building upon it…”
1 Corinthians 3:10

“But by the grace of God I am what I am, and His grace toward me was not in vain; but I labored more abundantly than they all, yet not I, but the grace of God which was with me.”  1 Corinthians 15:10 

Grace enables Believers to be in the world, but to live godly lives:
“Now this is our boast: Our conscience testifies that we have conducted ourselves in the world, and especially in our relations with you, in the holiness and sincerity that are from God.  We have done so  not according to worldly wisdom but according to God’s grace.”  2 Corinthians 1:12

Grace is promised to the humble:
“…Clothe yourselves with humility toward one another, for God is opposed to the proud, but gives grace to the humble.”  1 Peter 5:5

Grace is sufficient for all human needs:
“And He said to me, ‘My grace is sufficient for you, for My strength is made perfect in weakness…’” 2 Corinthians 12:9

Grace is not given for selfish use:
“As each one has received a gift, minister it to one another, as good stewards of the manifold grace of God.”  1 Peter 4:10

Grace, grace, wonderful grace, that sweet fragrance that fills our hearts and minds as we live unto and out from Christ Jesus our Lord!

I close with two wonderful verses of blessing:
“And God is able to make all grace abound to you, that always having all sufficiency in everything, you may have an abundance for every good deed.”  2 Corinthians 9:8
And,
“You, therefore, my son, be strong in the grace that is in Christ Jesus.”
2 Timothy 2:1

So we sing:
“His grace has no measure,
His mercies no end,
His love has no boundaries known unto men.
For out of the infinite riches in Jesus,
He giveth and giveth and giveth again.”