In 1 Corinthians 15:2, Paul warns against believing 'in vain'—the same phrase 'not in vain' here links his labor of grace to the need for believers to hold fast the gospel.

In 1 Corinthians 4:7, Paul argues that everything we have is received — reinforcing the same reliance on grace that makes him who he is in 15:10.

In 1 Cor 3:10, Paul echoes the same grace-given role, describing himself as a skilled master builder by God's grace.

In 1 Corinthians 3:6, Paul says he planted and God gave growth, reinforcing his point that his labor is by God's grace.

In 1 Timothy 1:16, Paul presents himself as the foremost sinner shown mercy as an example—echoing how his unworthiness magnifies the grace that made him what he is.

Colossians 1:29 directly parallels Paul's strenuous labor powered by Christ's energy—the same grace-driven effort.

Philippians 2:13 echoes God working in believers to will and act—parallel to Paul's labor being God's grace at work.

In Ephesians 3:8, Paul calls himself the least of saints and credits grace — mirroring his humility and grace-reliance in 15:9-10.

Ephesians 3:7 says Paul became a minister by the gift of God's grace — directly parallel to his statement in 15:10 that grace made him who he is.

Ephesians 2:8 declares salvation by grace through faith — the same grace that Paul says made him who he is in 15:10.

In Galatians 2:8, Paul states God worked through him for the Gentiles—specifying the same divine empowerment behind his tireless labor mentioned here.

In 2 Corinthians 12:11, Paul says he is 'nothing' yet not inferior—reinforcing that his labor is by grace, not self, as in 'not I, but the grace of God'.

In 2 Corinthians 11:23-30, Paul lists labors, beatings, and dangers—vividly illustrating the 'worked harder' claim with his actual sufferings for the gospel.

In 2 Corinthians 6:1, Paul urges not to receive God's grace 'in vain'—directly paralleling his own claim that grace was not in vain because he labored.

In 2 Corinthians 3:5, Paul denies self-sufficiency and credits God—directly aligning with 'not I, but the grace of God' as the source of his work.

In Romans 15:17-20, Paul describes his apostolic labor from Jerusalem to Illyricum—concrete evidence of the 'harder than any' work his grace produced.

Romans 11:6 states grace and works are mutually exclusive — same logic Paul applies when he says 'not I, but the grace of God' in 15:10.

In Acts 14:27, they report all God had done through them — Paul's testimony in this verse similarly credits grace for his labor.

1 Chronicles 29:14 declares everything comes from God—parallels Paul's humility that his labor is by God's grace.

In 1 Thessalonians 2:1, Paul uses the same phrase 'not in vain' to describe his ministry, reinforcing that his labor by grace was effective.

In 1 Timothy 1:12, Paul thanks Christ for strengthening him for service, directly paralleling the grace that enabled his labor here.

In Luke 17:10, servants say 'we have only done our duty' — Paul similarly credits grace, not his own effort, for his labor.

In Luke 18:11, the Pharisee boasts of his works — Paul contrasts by attributing his labor entirely to God's grace, not self.

In John 3:27, John says a person can only receive what is given from heaven — Paul echoes this by attributing all to grace.

In Gal 1:15, Paul was called by God's grace, directly paralleling 'by the grace of God I am what I am'.

In Acts 9:15, God calls Paul a chosen instrument — this verse shows Paul fulfilling that role by working hard through grace.

In 2 Cor 12:9, God's grace is sufficient and power perfected in weakness, reinforcing Paul's labor by grace.

In 2 Cor 11:5, Paul claims not to be inferior to super-apostles, directly linking to his claim of working harder.

In Acts 15:40, Paul is commended to the grace of God before his journey, illustrating the grace he credits for his labors in 1 Cor 15:10.

In 1 Timothy 1:14, Paul describes grace overflowing in his life, echoing the abundant grace that made his labor effective.

In 2 Cor 1:12, Paul emphasizes behavior by the grace of God, directly parallel to his labor by grace.

In Acts 21:19, Paul reports God's work through his ministry, directly echoing his statement that his labor is by God's grace.

In Romans 1:5, Paul states he received grace and apostleship, the very grace he credits for his hard work in 1 Cor 15:10.

In Romans 15:15, Paul writes boldly because of the grace given him, mirroring his claim that his work is by grace.

In Romans 12:3, Paul speaks by the grace given him, showing his ministry is grace-based, similar to his claim in 1 Cor 15:10.

In Acts 20:19, Paul describes his humble service and trials, illustrating the hard work he attributes to grace in 1 Cor 15:10.

Psalm 18:29 credits God for enabling David to run and leap—like Paul credits grace for his labor.

Psalm 108:13 says with God we do valiantly—echoes Paul's 'I worked but it was grace' partnership.

Genesis 41:16 has Joseph attributing ability to God—parallels Paul's reliance on God's grace for his labor.