We can say that true gratitude does not give rise to the debtor's ethic because it gives rise to faith in future grace. With true gratitude there is such a delight in the worth of God's past grace, that we are driven on to experience more and more of it in the future...it is done by transforming gratitude into faith as it turns from contemplating the pleasures of past grace and starts contemplating the promises of the future.
The fact is unalterable, that a fellow-mortal with whose nature you are acquainted solely through the brief entrances and exits of a few imaginative weeks called courtship, may, when seen in the continuity of married companionship, be disclosed as something better or worse than what you have preconceived, but will certainly not appear altogether the same.
My favorite quote: The land ethic simply enlarges the boundaries of the community to include soils, waters, plants, and animals, or collectively: the land... In short, a land ethic changes the role of Homo sapiens from conqueror of the land-community to plain member and citizen of it. It implies respect for his fellow-members, and also respect for the community as such.