Very humble and very bold

In preparing for an upcoming Sunday School lesson on influential missionaries, I have been re-reading Lesslie Newbigin: Missionary Theologian. What follows is one of many treasures to follow in days to come:

The Church, it seems to me, needs to be very humble in acknowledging that it itself is only a learner, needing to pay heed to all the variety of human experience in order to learn in practice what it means that Jesus is King and Head of the human race. But the Church also needs to be very bold, bold in bearing witness to him as the one who alone is the King and the Head. For the demonstration of the truth we have to wait for the end. (Lesslie Newbigin: Missionary Theologian p217)