2 Corinthians 12:8

Normally Paul meant Jesus Christ when he used the title "the Lord." There are other scriptural examples of believers addressing their prayers to the second person of the Trinity (Acts 1:24; Acts 7:59). However normally they addressed the Father in the name of the Son with the Spirit’s help (e.g., Ephesians 2:18). Here "Lord" definitely means God, and probably it means Jesus with emphasis on His being Paul’s master (cf. Acts 9:5). The fact that Paul repeated his petition three times shows how intensely he wanted God to remove his affliction, like Jesus in Gethsemane.