What was the name of the little, green, Catholic book?

I went on a retreat and my teacher pulled out this book. It was a visionary book, written by a Saint, I think. It talked about what the after life when heaven will be on Earth would be like. I can't remember the name! But, I can still recall my teacher pointing out that it said things like we can be in... show more I went on a retreat and my teacher pulled out this book. It was a visionary book, written by a Saint, I think. It talked about what the after life when heaven will be on Earth would be like. I can't remember the name! But, I can still recall my teacher pointing out that it said things like we can be in different places merely by thought, and other godly powers. What book was it?
Update: Also, it mentioned that everyone will be in their prime, about 30 years old.
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