Here is something very appropriate for the first day of the week, when we remember that Christ has indeed risen.
Leo the Great, On the Lord’s Resurrection
The Apostle of the Gentiles, Paul, dearly beloved, does not disagree with this belief [the belief that Christ’s identical body was resurrected], when he says, �even though we have known Christ after the flesh, yet now we know Him so no more.� For the Lord�s Resurrection was not the ending, but the changing of the flesh, and His substance was not destroyed by His increase of power. The quality altered, but the nature did not cease to exist: the body was made impassible, which it had been possible to crucify: it was made incorruptible, though it had been possible to wound it. And properly is Christ�s flesh said not to be known in that state in which it had been known, because nothing remained passible in it, nothing weak, so that it was both the same in essence and not the same in glory. But what wonder if S. Paul maintains this about Christ�s body, when he says of all spiritual Christians �wherefore henceforth we know no one after the flesh.� Henceforth, he says, we begin to experience the resurrection in Christ, since the time when in Him, Who died for all, all our hopes were guaranteed to us. We do not hesitate in diffidence, we are not under the suspense of uncertainty, but having received an earnest of the promise, we now with the eye of faith see the things which will be, and rejoicing in the uplifting of our nature, we already possess what we believe. (…)
Let God�s people then recognize that they are a new creation in Christ, and with all vigilance understand by Whom they have been adopted and Whom they have adopted. let not the things, which have been made new, return to their ancient instability; and let not him who has �put his hand to the plough� forsake his work, but rather attend to that which he sows than look back to that which he has left behind. Let no one fall back into that from which he has risen, but, even though from bodily weakness he still languishes under certain maladies, let him urgently desire to be healed and raised up. For this is the path of health through imitation of the Resurrection begun in Christ, whereby, notwithstanding the many accidents and falls to which in this slippery life the traveler is liable, his feet may be guided from the quagmire on to solid ground, for, as it is written, �the steps of a man are directed by the Lord, and He will delight in his way.