4:1 But in the last days it shall come to pass, that the mountain of the house of the LORD [God's Kingdom] shall be established in the top of the mountains [the little kingdoms of man], and it shall be exalted above the hills [the little kingdoms of man]; and people shall flow to it.

4:2 And many nations shall come, and say, Come, and let us go up to the mountain of the LORD [God's Kingdom], and to the house of the God of Jacob [God's Kingdom, the final state of the true Church]; and he will teach us of his ways, and we will walk in his paths: for the law shall go forth of Zion [the true Church], and the word of the LORD from Jerusalem [the true Church].

4:3 And he shall judge among many people, and rebuke strong nations afar off; and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up a sword against nation, neither shall they learn war any more.

4:4 But they shall sit every man under his vine and under his fig tree; and none shall make them afraid: for the mouth of the LORD of hosts hath spoken it.

4:5 For all people will walk every one in the name of his god, and we will walk in the name of the LORD our God for ever and ever.

This is a kingdom word.  The mountain here is not speaking of a physical mountain but a spiritual kingdom, the culmination of all that God is proposing to the church that is built according to His pattern, the pattern of Scripture.  This same word is given in Isaiah 2:2-4 and Philippians 2:10-11.  Nebuchadnezzar's dream shows us the same thing: Daniel 2-41-45.

This word speaks of the culmination of the ages when the Lord will come forth in power.  The Lord will put down all spiritual and earthly power and authority in this age and in the age that is to come.  He will come with ten thousand of His faithful saints to set up His Kingdom, and that Kingdom is an everlasting one.  The Lord, Himself, will rule as King of kings and Lord of lords.  Everything will be put under His feet.  We don't now see all things put under His feet, but that day is coming.  Praise the Lord!