But mark both their faith, and their obedience. For though they were in the midst of their work (and you know how greedy a thing fishing is), when they heard His command, they delayed not, they procrastinated not, they said not, “let us return home, and converse with our kinsfolk,” but “they forsook all and followed,” even as Elisha did to Elijah. Because such is the obedience which Christ seeks of us, as that we delay not even a moment of time, though something absolutely most needful should vehemently press on us. Wherefore also when some other had come unto Him, and was asking leave to bury his own father, not even this did He permit him to do; to signify that before all we ought to esteem the following of Himself.
But if you should say, “the promise is very great;” even for this do I most admire them, for that when they had not as yet seen any sign, they believed in so great a reach of promise, and accounted all but second to that attendance. And this, because they believed that by what words they were caught, by the same they would be able to catch others also.
To these, then, such was His promise: but to James and John He says no such thing. For the obedience of those that had gone before had by this time paved the way for these. And besides they had also heard many things before concerning Him.
And see how he does with exact care intimate unto us their poverty also: in that He found them sewing up their nets. So exceeding great was their poverty, that they were mending what was worn out, not being able to buy others. And this too was for the time no small proof of virtue, their beating poverty with ease, their supporting themselves by honest labor, their being bound one to another by the power of love, their having their father with them, and attending upon them.
When therefore He had caught them, then He begins in their presence to work miracles, by His deeds confirming the words of John concerning Him. And He was continually frequenting their synagogues, even by this instructing them that He was not a sort of adversary of God and deceiver, but that He had come in accordance with the Father.
And while frequenting them, He did not preach only, but also showed forth miracles. And this, because on every occasion, whenever anything is done strange and surprising, and any polity is introduced, God is wont to work miracles as pledges of his power, which He affords to them that are to receive His laws. Thus, for instance, when He was about to make man, He created a whole world, and then gave him that law which he had in Paradise. And when He was to give laws to Noah, He showed forth anew great miracles, in that He reduced again the whole creation to its elements, and made that fearful sea to prevail for a full year; and in that, amid so great a tempest, He preserved that righteous man. And in the time of Abraham too He vouchsafed many signs; as his victory in the war, the plague upon Pharaoh, his deliverance from dangers. And when about to legislate for the Jews, He showed forth those marvellous and great prodigies, and then gave the law. Just so in this case also, being to introduce a certain high polity, and to tell them what they had never heard, by the display of the miracles He confirms what He says.
Thus because the kingdom He was preaching appeared not, by the things that appear, He makes it, though invisible, manifest.
St John Chrysostom