The TED talk by Kate Bowler referenced in the sermon may be found here. The "Quote of the Day" that is referred to is by N.T. Wright and is taken from his book, For All God's Worth: True Worship and the Calling of the Church. It is as follows:
“You see, the doctrine of the Trinity, properly understood, is as much a way of saying ‘we don’t know’ as of saying ‘we do know.’ To say that the true God is Three and One is to recognize that if there is a God then of course we shouldn’t expect him to fit neatly into our little categories. If he did, he wouldn’t be God at all, merely a god, a god we might perhaps have wanted. The Trinity is not something that the clever theologian comes up with as a result of hours spent in the theological laboratory, after which he or she can return to announce that they’ve got God worked out now, the analysis is complete, and here is God neatly laid out on a slab. The only time they laid God out on a slab he rose again three days afterwards.”