1 For Zion's sake will I not hold my peace, and for Jerusalem's sake I will not rest, until the righteousness thereof go forth as brightness, and the salvation thereof as a lamp that burneth.
2 And the Gentiles shall see thy righteousness, and all kings thy glory: and thou shalt be called by a new name, which the mouth of the LORD shall name.
3 Thou shalt also be a crown of glory in the hand of the LORD, and a royal diadem in the hand of thy God.
4 Thou shalt no more be termed Forsaken; neither shall thy land any more be termed Desolate: but thou shalt be called Hephzi-bah, and thy land Beulah: for the LORD delighteth in thee, and thy land shall be married.
5 For as a young man marrieth a virgin, so shall thy sons marry thee: and as the bridegroom rejoiceth over the bride, so shall thy God rejoice over thee.
6 I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night: ye that make mention of the LORD, keep not silence,
7 And give him no rest, till he establish, and till he make Jerusalem a praise in the earth.
8 The LORD hath sworn by his right hand, and by the arm of his strength, Surely I will no more give thy corn to be meat for thine enemies; and the sons of the stranger shall not drink thy wine, for the which thou hast laboured:
9 But they that have gathered it shall eat it, and praise the LORD; and they that have brought it together shall drink it in the courts of my holiness.
10 Go through, go through the gates; prepare ye the way of the people; cast up, cast up the highway; gather out the stones; lift up a standard for the people.
11 Behold, the LORD hath proclaimed unto the end of the world, Say ye to the daughter of Zion, Behold, thy salvation cometh; behold, his reward is with him, and his work before him.
12 And they shall call them, The holy people, The redeemed of the LORD: and thou shalt be called, Sought out, A city not forsaken.
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There is a time for everything: for silent standing before God and for spoken ministry. First it is necessary that trust in God and readiness to follow Him take root in the heart, and then the hour comes when He calls one to preach. Such a time also comes for Isaiah's compatriots: after a series of trials, having become more spiritually mature, they must proclaim the Truth to all nations. The light of God must first shine in Jerusalem, but it will not shine only for its inhabitants; it is intended for all nations.
If so, then it is not enough for preachers to repeat memorized formulas; they must become conduits of the light that illumines the world, and therefore they must be capable of not clouding the light and not blocking it with their own darkness. This is much harder than repeating ready-made verbal blocks in a well-trained speech, but is it worth going out to preach if one is not open to the influence of the One about whom we preach? If we are ready to receive His transforming influence, then we will receive from Him the words needed for preaching as well.