Why can you rest on what Isaiah says according to Les?
Isaiah's words carry absolute certainty because they are God speaking through the prophet, not human speculation. The phrase 'it shall come to pass' marks a divine promise that will surely happen, including the last-days kingdom being established above all kingdoms and all nations flowing to it.
Les explains that Isaiah chapter 2, verse 2, is God speaking through the prophet, so the listener can rest on it. He points out that 'it shall come to pass in the last days' that the mountain or kingdom of the Lord's house will be established in the top of the mountains, exalted above the hills, meaning it will be the eminent kingdom above all smaller kingdoms. Les highlights the last three words, 'they'll flow unto it,' referring to all Gentile nations flowing into that kingdom. Because the source is God Himself, the promise is certain.
And it shall come to pass in the last days, that the mountain of the LORD’s house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow unto it.