The Greek kago is a crasis (contraction) of kai (and) + ego (I), meaning 'and I,' 'I also,' or 'I too.' It emphasizes the speaker's participation alongside others — a conjunction of identity and solidarity.
The little word kago carries enormous theological freight in the Gospel of John. Jesus uses it repeatedly to express his unity with and sending from the Father, and now his sending of the disciples: 'As the Father has sent me, I also send you' (John 20:21). The chain of mission — Father sends Son, Son sends disciples — is linked by kago: 'just as... so also I.' This structural word builds the entire missional theology of John's Gospel. Similarly, in John 10:28–29, Jesus says the Father gave the sheep to him and 'I and the Father are one' — divine solidarity expressed through this grammatical union. Kago is the word of identification and participation: where God acts, the Son acts; where the Son sends, the disciples go.