Question
What does it mean to be "born again"? (Jesus' words to Nicodemus in John 3)
Analysis
"Again" or "from above"?
The Greek word behind "born again" (anōthen) can mean "again" or "from above." Both senses fit John's point: the new birth is a second birth, and it comes from above, from God, not from human effort or ancestry (John 1:13). Nicodemus hears only "again" and pictures re-entering the womb (John 3:4); Jesus lifts him to the higher meaning, a birth from God's Spirit.
"Water and the Spirit"
John 3:5 says "born of water and the Spirit," and Christians have read "water" in a few ways: as baptism, as natural birth (paired with spiritual birth), as the cleansing God promised, or as God's word that washes (Ephesians 5:26). Behind the phrase stands Ezekiel 36:25–Ezekiel 36:27, where God promises to sprinkle clean water on His people and put a new heart and a new spirit in them, the Old Testament picture of exactly this inner renewal. Traditions differ on the precise role of baptism here, but the shared core is plain: the new birth is a cleansing, life-giving work of God's Spirit.
The same idea in other words
The New Testament describes this one reality with several images: the new birth (1 Peter 1:3; 1 Peter 1:23), the new creation (2 Corinthians 5:17), and … (Titus 3:5). All point to a change God works from the inside, a person given new spiritual life, rather than merely turning over a new leaf.