I think he stated, in broad conceptual terms, the highest principles of his vision for his new role as President. (To make our country more just and generous, to affirm the dignity of our lives and every life.)
Then he described his view that the goal is larger than one man's role (This work continues. This story goes on.)
And lastly, he disclosed his view that God's work was being carried out ( And an angel still rides in the whirlwind and directs this storm.)
At the time I just thought to myself that it was about time a Republican got a decent speech writer.
Ha -- Bush has given some excellent speeches: the address to Congress and that to the UN were remarkable. However, the phrase "angel rides in the whirlwind and directs this storm" strongly connotates judgment or chastisement in a lexicographical sense, with the Bible as lexicon. And the phrase is too close to biblical usage for it to be construed simply as poetry or high rhetoric.