6 Concerning then this Resurrection of the dead, my beloved, according to my power I will instruct you. For from the beginning God created Adam; moulded him from the dust of the earth, and raised him up. For if, while Adam was not, He made him from nothing, how much easier now is it for Him to raise him up; for lo! As a seed he is sown in the earth. For if God should do those things that are easy for us, His works would not appear mighty to us. For lo! There are among men artificers who make wonderful things, and those who are not artificers of the works stand and wonder how they were done; and the work of their fellows is difficult in their eyes.
How much more should not the works of God be as a marvel! But for God this was no great thing, that the dead should be quickened. Before seed was sown in the earth, the earth produced that which had not been cast into it. Before it had conceived, it bore in its virginity. How then is this difficult, that the earth should cause to spring up again what had been cast into it, and after conception should bear? And lo! Her travail-pains are near; as Isaiah said, Who has seen anything like this and who has heard such things as these?
That the earth should travail in one day, and a people should be born in one hour</em>? For Adam unsown sprang up; unconceived he was born. But lo! now his offspring are sown, and wait for the rain, and shall spring up. And lo! The earth teems with many, and the time of her bringing forth is at hand.
Source: Demonstrations (New Advent)