John Chrysostom
He says that they must not be troubled, because nothing extraordinary or unexpected is happening to us. This was enough to encourage them.
Do you see that Christ also foretold things to His disciples for the same reason? Listen, indeed, to what He says: “And now I have told you before it comes to pass, that when it does come to pass, you may believe” (Jn 14:29).
It gives much, truly much, consolation to disciples when they hear from their teachers what will happen to them. If a sick man hears beforehand from the physician that this or that will happen to him, he is not too greatly troubled.
But if something unexpected happens to him, so that the physician himself is perplexed and the illness surpasses his skill, then the sick man grows despondent and troubled. So it is here also.
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Paul, foreseeing this, foretold them: “We shall suffer affliction,” he says, “as indeed happened, and you know.” The Apostle speaks not only of what happened, but also of the fact that he had foretold many other things that likewise came to pass.
“We are appointed to this.” Therefore one must not be troubled and disturbed by past temptations alone, for that is what “to be shaken” means. One must not be troubled by future ones either, should they occur. “We are appointed to this.”