These stories are not however just poignant passing images within Jesus' and Mary's lives, but point to something fundamental about the character of the incarnation itself.
It is easier perhaps to think of Mary as the one who submits to God's gracious but powerful will in saying "yes" to the divine message. But in fact the incarnation is above all a submission by God to the perils of human existence. Journeying into human life was as always a risky business, for child as for mother; pregnancy and birth may be marvels of life, but they are dangerous ones.
In John's Gospel the incarnation is described in these remarkable terms: "the Word became flesh and lived among us". The Greek word translated "lived" or in older versions "dwelt" (ἐσκήνωσεν), is literally something more like "make camp" - and it sometimes means "to find a harbour". Thus while the first part of that verse tells us that the Word really does become flesh, and does not merely borrow human clothes for the sake of the Gospel, the second part suggests a sojourn, a journey, and yes literally a voyage - "the Word became flesh, and sailed into our immigration zone". John says in the same prologue about the incarnation that “his own people did not receive him” – some things have not changed.
The incarnation is thus the beginning of God’s acceptance of risk, of frailty and mortality, of which the Cross itself is the definitive sign and fulfilment, the ironic journey's end where God shows his triumph precisely in the thing we fear and avoid most, the sign that the incarnation really was God's sharing in our human life completely.
God's journey to birth through Mary, into the leaky boat of human existence, is undertaken not for Jesus' safety and freedom however but for ours. Most Australians have much to be thankful for, in freedom, security and relative prosperity, materially speaking. God arrives, become flesh, on the shore of our lives and offers even more; true freedom, fullness of life. Accepting citizenship of God's reign may find us changing how we deal with our own material realities; it calls us to consider afresh what true security, real prosperity, and lasting freedom are.