THEOSISJohn Chrysostom
Mark how great His promise to them, men who were scarce known in their own country that the fame of them should reach to the ends of the earth. The persecutions which He had foretold, were not able to dim their light, yea they made it but more conspicuous.
Thus shewing them that they ought to be careful of their own walk and conversation, seeing they were set in the eyes of all, like a city on a hill, or a lamp on a stand.
Or, in the illustration of the city, He signified His own power, by the lamp He exhorts the Apostles to preach with boldness; as though He said, ‘I indeed have lighted the lamp, but that it continue to burn will be your care, not for your own sakes only, but both for others who shall receive its light and for God’s glory.’
A city set on a hill cannot be hidden though it would; the mountain which bears makes it to be seen of all men; so the Apostles and Priests who are founded on Christ cannot be hidden even though they would, because Christ makes them manifest.
This city is the Church of which it is said, Glorious things are spoken of thee, thou city of God. (Ps. 87:3.) Its citizens are all the faithful, of whom the Apostle speaks, Ye are fellow-citizens of the saints. (Eph. 2:19.) It is built upon Christ the hill, of whom Daniel thus, A stone hewed without hands (Dan. 2:34.) became a great mountain.
But to live well must go before to teach well; hence after He had called the Apostles the salt, He goes on to call them the light of the world. Or, for that salt preserves a thing in its present state that it should not change for the worse, but that light brings it into a better state by enlightening it; therefore the Apostles were first called salt with respect to the Jews and that Christian body which had the knowledge of God, and which they keep in that knowledge; and now light with respect to the Gentiles whom they bring to the light of that knowledge.
How Christ manifests His saints, suffering them not to be hid, He shews by another comparison, adding, Neither do men light a lamp to put it under a corn-measure, but on a stand.
The lamp is the Divine word, of which it is said, Thy word is a lamp unto my feet. (Ps. 119:105.) They who light this lamp are the Father, the Son, and the Holy Spirit.
Or, men of the world may be figured in the corn-measure as these are empty above, but full beneath, so worldly men are foolish in spiritual things, but wise in earthly things, and therefore like a corn-measure they keep the word of God hid, whenever for any worldly cause he had not dared to proclaim the word openly, and the truth of the faith. The stand for the lamp is the Church which bears the word of life, and all ecclesiastical persons. (vid. Phil. 2:15.)
That is, teaching with so pure a light, that men may not only hear your words, but see your works, that those whom as lamps ye have enlightened by the word, as salt ye may season by your example. For by those teachers who do as well as teach, God is magnified; for the discipline of the master is seen in the behaviour of the family. And therefore it follows, and they shall glorify your Father which is in heaven.