13 And not only as it regards our body, and the various states of life, is this diversity observable; nor is it confined to brutes; but it may be seen also in trees; and the meanest of them may be observed to have an excellence above those which are greater; so that all things are not alike in all, that all may be necessary to us; and that we may perceive the manifold wisdom of the Lord. Do not then lay blame on God on account of the body's corruptibleness, but for this the rather do Him homage, and admire Him for His wisdom and His tender care; His wisdom, that in so corruptible a body He has been able to display such harmony; His tender care that for the benefit of the soul He has made it corruptible, that He might repress her vanity, and subdue her pride!
Why then did He not make it thus from the beginning, asks some one? It was, I reply, to justify Himself before you by these very works; and as much as to say by the result itself, I called you to greater honour, but you constituted yourself unworthy of the gift, banishing yourself from Paradise! Nevertheless, I will not even now despise you, but I will correct your sin, and bring you back to heaven. Therefore for your own sake, I have permitted you so long to decay and suffer corruption, that in the fullness of time the discipline of your humility might be established; and that you might never more resume your former conceit.
Source: Homilies on the Statues (New Advent)