I must (με δε). Jesus felt the urge to go with the work of evangelism "to the other cities also," to all, not to a favoured few.

For therefore was I sent (οτ επ τουτο απεσταλην). "A phrase of Johannine ring" (Ragg). Second aorist passive indicative of αποστελλω. Christ is the great Apostle of God to men.