From Luther's Commentary on the Apostle's Creed

"I believe in God the father almighty, creator of heaven and earth"
Here, first of all, a great light shines into your heart if you permit it to and teaches you in a few words what all the languages of the world and a multitude of books cannot describe or fathom in words, namely, who you are, whence you came, whence came heaven and earth. You are God's creation, his handiwork. That is, of yourself and in yourself you are nothing, can do nothing, know nothing, are capable of nothing. What were you a thousand years ago? What were heaven and earth before creation? Nothing, just as that which will never be created is nothing. But what you are, know, can do, and can achieve is God's creation, as you confess in the Creed by word of mouth. Therefore you have nothing to boast about before God except that you are nothing and He is your Creator who can annihilate you at any moment.
Reason knows nothing of such a light. Many great thinkers sought to know what heaven and earth, people and animals are and have found no answer. But here is declared and faith affirms that God has created everything out of nothing. Here is the soul's garden of pleasure, along whose paths we enjoy the works of God- bit it would take too long to describe all that.
Furthermore, we should give thanks to God in that His kindness He has created us out of nothing and provides for our daily needs out of nothing- has made us to be such excellent beings with body and soul, intelligence, five senses, and has ordained us to be masters of earth, of fish, bird, beast, etc. Here consider Genesis, chapters one, two and three.
Third, we should confess and lament our lack of faith and gratitude in failing to take this to heart, or to believe, ponder, and acknowledge it, and having been more stupid than unthinking beasts.
Fourth, we pray for a true and confident faith that sincerely esteems and trusts God to be our Creator, as this article declares.