Has the Gospel Already Reached the Entire World?

Here's the question. "Pastor John, hello! My name is Kevin, and I live in Chicago. My question has to do with Paul's words in Colossians 1:6, where he speaks of the gospel that has 'come to you, as indeed in the whole world.' He maybe suggested that the gospel had already reached the whole world in his lifetime. It seems clearer in Colossians 1:23. There Paul speaks of the hope 'of the gospel that you heard, which has been proclaimed in all creation under heaven.' Wow. So what does Paul mean when he says that the hope of the gospel has already been proclaimed in all creation? I feel an urgency to unreached nations. But these texts have dampened that urgency in me some. Can you explain what Paul means here? Thank you!"