The most-likely author of 1 Corinthians 2:9 is the apostle Paul. According to evangelical Christian tradition and belief, Paul was a primary figure in the early Christian church and is credited with writing many of the books in the New Testament, including 1 Corinthians.

Paul was originally known as Saul of Tarsus and was a Pharisee who persecuted early Christians before his conversion to Christianity. After his conversion, Paul became a fervent follower of Jesus Christ and traveled extensively, spreading the gospel and establishing churches throughout the Roman Empire. He wrote numerous letters to these churches, offering them guidance, instruction, and encouragement in their faith.

1 Corinthians is one of the letters attributed to Paul, and in it, he addresses the church in Corinth, emphasizing the importance of unity, love, and spiritual gifts within the community of believers. In 1 Corinthians 2:9, Paul quotes from the Old Testament book of Isaiah, emphasizing the mystery and wonder of God’s plan for those who love Him.

Evangelical Christians view Paul as a foundational figure in the development and spread of the early Christian church, and his writings in the New Testament are considered to be inspired by the Holy Spirit and authoritative for Christian belief and practice. They see 1 Corinthians 2:9 as a powerful reminder of the incredible future that awaits those who belong to Christ.