The Greek eutheōs (G2112) means immediately or at once — and it is arguably the most characteristic word of Mark's Gospel, where it appears over 40 times. After Jesus calls a disciple, they follow immediately. After He heals, the person is well immediately. After the baptism, the Spirit drives Him into the desert immediately. The word captures the urgency and authority of Jesus' ministry — nothing drags or delays in Mark; the Kingdom of God arrives with the force and speed of divine action.
Eutheōs in Mark is not merely a narrative device — it is a theological statement. The Kingdom of God does not arrive gradually or tentatively; it breaks in with sudden, decisive power. When Jesus speaks, things happen. When He heals, the healing is complete and instant. This is the God of the exodus, who acted swiftly to deliver (Exodus 12:12: 'On that same night I will pass through Egypt'). For the believer, eutheōs is also the appropriate response to divine calling — as the disciples demonstrate by leaving their nets 'immediately' and following (Mark 1:18, 20). Obedience need not wait.