In the latter days...

It shall come to pass in the latter days that the mountain of the house of the Lord shall be established as the highest of the mountains, and shall be lifted up above the hills; and all the nations shall flow to it, and many people shall come, and say
"Come, let us go up to the mountains of the Lord...
that he may teach us his ways and that we may walk in his paths."
...and they shall beat their swords into plowshares, their spears into pruning hooks; nation shall not lift up sword against nation, neither shall they learn war anymore.
O house of Jacob, come, let us walk in the light of the Lord.
Isaiah 2:1-5 (bits and pieces)

One day.