The Greek verb katalambano combines kata (down, intensifying) and lambano (to take/receive), meaning 'to seize forcibly, catch, overtake, or comprehend.' It appears about 15 times in the New Testament with a range of meanings: catching someone in the act, overtaking like darkness, and spiritually grasping the depths of God's love.
Katalambano spans two key theological domains. In the judicial sense, it describes being caught or overtaken: John 8:3, 'the teachers of the law and the Pharisees brought in a woman caught (katalephtheisan) in adultery.' John 12:35 warns: 'Believe in the light while you have it, so that darkness may not overtake (katalabe) you.' In the comprehension sense, it describes the grasping of spiritual truth — a mental and spiritual seizing. Ephesians 3:18 contains Paul's great prayer that believers may 'have power, together with all the Lord's holy people, to grasp (katalabesthay) how wide and long and high and deep is the love of Christ.' This comprehension is not merely intellectual; it requires 'together with all the Lord's holy people' — it is a corporate and Spirit-empowered act. Philippians 3:12 uses katalambano for pressing forward in the Christian life: 'Not that I have already obtained all this, or have already arrived at my goal, but I press on to take hold (katalabo) of that for which Christ Jesus took hold of me.'