Krateō (G2902) means to hold firmly, seize, or take hold of. It conveys the act of gripping with strength — whether arresting someone, holding onto a teaching, or clinging to God in faith. It often appears in contexts requiring firm resolve.
Hebrews 4:14 commands believers to 'hold firmly (kratōmen) to the faith we profess.' Revelation repeatedly calls the seven churches to 'hold fast' what they have. In the arrest of Jesus, the guards 'laid hands on' (ekratēsan) Him — the earthly power that could only do so because He permitted it (John 18:12). Those who hold fast to Christ in faith will themselves be held by His greater grip (John 10:28–29).