John Chrysostom
Having praised them, he then says: "Therefore do not cast away your confidence, which has great reward." What are you saying? He did not say, "You have lost your boldness; acquire it again," lest they fall into despair. Instead he says, "You have it; do not lose it." By this he encourages them more strongly and gives them strength.
You have boldness, he says, so as to acquire again what was lost. Greater labor is needed for that, while not losing what one has is not so hard.
To the Galatians he writes differently: "My little children, for whom I labor in birth again until Christ is formed in you" (Gal 4:19). And rightly so. They were negligent, so they needed more reproving speech. These showed some faintheartedness, so they needed a more condescending word.
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"Therefore do not cast away," he says, "your confidence." Therefore they had great boldness before God.
"Which has," he says, "great reward." What does this mean? We shall receive it then, he says. If it is prepared in the future, we must not seek it here.
Then, lest someone say, "Everything on our part has been done," he anticipates this thought. It is as if he says: if you know that you have in heaven a better possession, then seek nothing here. You need patience, not an increase of contests, so that you may remain as you are and not lose what has been given to you.
You need nothing else except to stand as you stand, so that, having reached the end, you may receive what was promised.