Romans 11:6

But if it is by grace [God’s unmerited favor], it is no longer on the basis of works, otherwise grace is no longer grace [it would not be a gift but a reward for works].

Deuteronomy 9:4-6

“Do not say in your heart when the Lord your God has driven them out before you, ‘Because of my righteousness the Lord has brought me in to possess this land,’ but because of the wickedness of these nations the Lord is dispossessing them before you.

Romans 3:27-28

Then what becomes of [our] boasting? It is excluded [entirely ruled out, banished]. On what principle? On [the principle of good] works? No, but on the principle of faith.

Romans 4:4-5

Now to a laborer, his wages are not credited as a favor or a gift, but as an obligation [something owed to him].

Romans 5:20-21

But the Law came to increase and expand [the awareness of] the trespass [by defining and unmasking sin]. But where sin increased, [God’s remarkable, gracious gift of] grace [His unmerited favor] has surpassed it and increased all the more,

1 Corinthians 15:10

But by the [remarkable] grace of God I am what I am, and His grace toward me was not without effect. In fact, I worked harder than all of the apostles, though it was not I, but the grace of God [His unmerited favor and blessing which was] with me.

Galatians 2:21

I do not ignore or nullify the [gracious gift of the] grace of God [His amazing, unmerited favor], for if righteousness comes through [observing] the Law, then Christ died needlessly. [His suffering and death would have had no purpose whatsoever.]”

Galatians 5:4

You have been severed from Christ, if you seek to be justified [that is, declared free of the guilt of sin and its penalty, and placed in right standing with God] through the Law; you have fallen from grace [for you have lost your grasp on God’s unmerited favor and blessing].

Ephesians 2:4-9

But God, being [so very] rich in mercy, because of His great and wonderful love with which He loved us,

2 Timothy 1:9

for He delivered us and saved us and called us with a holy calling [a calling that leads to a consecrated life—a life set apart—a life of purpose], not because of our works [or because of any personal merit—we could do nothing to earn this], but because of His own purpose and grace [His amazing, undeserved favor] which was granted to us in Christ Jesus before the world began [eternal ages ago],

Titus 3:5

He saved us, not because of any works of righteousness that we have done, but because of His own compassion and mercy, by the cleansing of the new birth (spiritual transformation, regeneration) and renewing by the Holy Spirit,

Treasury of Scripture Knowledge

Summary

And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work.

Bible References

And if

Romans 3:27
Then what becomes of [our] boasting? It is excluded [entirely ruled out, banished]. On what principle? On [the principle of good] works? No, but on the principle of faith.
Romans 4:4
Now to a laborer, his wages are not credited as a favor or a gift, but as an obligation [something owed to him].
Romans 5:20
But the Law came to increase and expand [the awareness of] the trespass [by defining and unmasking sin]. But where sin increased, [God’s remarkable, gracious gift of] grace [His unmerited favor] has surpassed it and increased all the more,
Deuteronomy 9:4
“Do not say in your heart when the Lord your God has driven them out before you, ‘Because of my righteousness the Lord has brought me in to possess this land,’ but because of the wickedness of these nations the Lord is dispossessing them before you.
1 Corinthians 15:10
But by the [remarkable] grace of God I am what I am, and His grace toward me was not without effect. In fact, I worked harder than all of the apostles, though it was not I, but the grace of God [His unmerited favor and blessing which was] with me.
Galatians 2:21
I do not ignore or nullify the [gracious gift of the] grace of God [His amazing, unmerited favor], for if righteousness comes through [observing] the Law, then Christ died needlessly. [His suffering and death would have had no purpose whatsoever.]”
Galatians 5:4
You have been severed from Christ, if you seek to be justified [that is, declared free of the guilt of sin and its penalty, and placed in right standing with God] through the Law; you have fallen from grace [for you have lost your grasp on God’s unmerited favor and blessing].
Ephesians 2:4
But God, being [so very] rich in mercy, because of His great and wonderful love with which He loved us,
2 Timothy 1:9
for He delivered us and saved us and called us with a holy calling [a calling that leads to a consecrated life—a life set apart—a life of purpose], not because of our works [or because of any personal merit—we could do nothing to earn this], but because of His own purpose and grace [His amazing, undeserved favor] which was granted to us in Christ Jesus before the world began [eternal ages ago],
Titus 3:5
He saved us, not because of any works of righteousness that we have done, but because of His own compassion and mercy, by the cleansing of the new birth (spiritual transformation, regeneration) and renewing by the Holy Spirit,

General references

Genesis 6:8
But Noah found favor and grace in the eyes of the Lord.
Psalm 44:9

But now You have rejected us and brought us to dishonor,
And You do not go out with our armies [to lead us to victory].
Isaiah 17:6

“Yet gleanings will be left in the land [of Israel] like the shaking of the olive tree,
Two or three olives on the topmost branch,
Four or five on the [outermost] branches of the fruitful tree,”
Declares the Lord, the God of Israel.
Isaiah 65:8
This is what the Lord says,

“As the new wine is found in the cluster,
And one says, ‘Do not destroy it, for there is a blessing and benefit in it,’
So I will do for the sake of My servants
In order not to destroy all of them.
Lamentations 3:31

For the Lord will not reject forever,
Ezekiel 6:8
“Yet I will leave some of you alive [a remnant], for you will have some who escaped the sword among the nations when you are scattered throughout the countries.
Acts 28:24
Some were persuaded by what he said, but others would not believe.
Romans 4:4
Now to a laborer, his wages are not credited as a favor or a gift, but as an obligation [something owed to him].
Ephesians 2:9
not as a result of [your] works [nor your attempts to keep the Law], so that no one will [be able to] boast or take credit in any way [for his salvation].