That the colony has great potential but has already proven successful.
The writer explains the colony is producing farm goods and as he states the best pork anywhere in the world. He also points out the horses available for the leisure of the people living in the colony. He also points out that much of the colony has not been developed. This means there is a lot of potential in the colony that can be developed yet.
Documents like this one convinced people in England that the Virginia colony could offer new opportunities and wealth. For people willing to take the risk, the New World could offer new land for farming. Virginia would draw people wanting to take the risk or willing to leave England behind. The colony would begin to grow with men in particular willing to work and start over.