How awesome it is that a tribal leader and representative of so many people, nations that had lived in this particular land for hundreds of years prior, would claim no right to the land, but only that it's been a gift to his people, though 'God-willing' would remain one.
Now I'm sure there's a larger context to the statement and I assume his desire truly was to keep his land free from the effects of the Europeans, at least the negative effects. That said, it's a truly fantastic worldview. I immediately think of Paul's comments regarding the Believers state of being in this land:
'So we fix our eyes not on what is seen, but what is unseen. For what is seen is temporary, but what is unseen is eternal...We are confident, I say, and would prefer to be away from the body and at home with the Lord.' (2 Cor. 4:18, 5:8)
Paul does something often in his letters. He spends time noting how thankful he is that God is working _____, or that his audience is _____, or that the Spirit has been _____. So on the one hand we set our hope on the eternal land that God has set apart for His people, yet we remain thankful of our current blessings, which God allows and/or provides. Paul notes that our bodies are temporary and all the while he models a spirit of humble thankfulness.
We still live in a land in between. In between what was perfect in the Garden of Eden and what will be perfect when The Great Being (Jesus Christ) redeems His creation in full. Claim nothing, but humbly honor what has been given, most notably reconcilliation with the Creator through Christ.
Read 2 Corinthians 5:1-10 for a discussion on the temporary nature of the body and the real purpose of life. Read His Exellency George Washington by Joseph J. Ellis