A common question: Why did God create the universe? Well, here’s a thought for you from the City of God:
And by the words, ‘God saw that it was good,’ it is sufficiently intimated that God made what was made not from any necessity, nor for the sake of supplying any want, but solely from His own goodness, i.e. because it was good. And this is stated after the creation had taken place, that there might be no doubt that the thing made satisfied the goodness on account of which it was made. (book 11, section 24, latter half)
Augustine’s explanation as to why God created the universe was as an overflow of His goodness, it seems to me, and this makes a lot of sense to me.
Here’s a great quote a few words later:
“In this, too, is the origin, the enlightenment, of the blessedness of the holy city which is above among the holy angels. For if we inquire whence it is, God created it; or whence its wisdom, God illumined it; or whence its blessedness, God is its bliss. It has its form by subsisting in Him; its enlightenment by contemplating Him; its joy by abiding in Him. It is; it sees; it loves. In God’s eternity is its life; in God’s truth is its light; in God’s goodness its joy.”