Much time has passed since the first colonists came to rocky shores and dark forests of an unknown continent, much time since President Washington led a young people into the experience of nationhood, much time since President Lincoln saw the American nation through the ordeal of fraternal war — and in these years our population, our plenty and our power have all grown apace. Today we are a nation of nearly two hundred million souls, stretching from coast to coast, on into the Pacific and north toward the Arctic, a nation enjoying the fruits of an ever-expanding agriculture and industry and achieving standards of living unknown in previous history. We give our humble thanks for this.
Yet, as our power has grown, so has our peril. Today we give our thanks, most of all, for the ideals of honor and faith we inherit from our forefathers — for the decency of purpose, steadfastness of resolve and strength of will, for the courage and the humility, which they possessed and which we must seek every day to emulate. As we express our gratitude, we must never forget that the highest appreciation is not to utter words but to live by them.
Let us therefore proclaim our gratitude to Providence for manifold blessings — let us be humbly thankful for inherited ideals — and let us resolve to share those blessings and those ideals with our fellow human beings throughout the world.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "Much time has passed since the first colonists came to rocky shores and dark forests of an unknown continent, much time since President Washington led a young people into the experience of nationhood, much time since President Lincoln saw the American nation through the ordeal of fraternal war — and in these years our population, our plenty and our power have all grown apace. Today we are a nation of nearly two hundred million souls, stretching from coast to coast, on into the Pacific and north toward the Arctic, a nation enjoying the fruits of an ever-expanding agriculture and industry and achieving standards of living unknown in previous history. We give our humble thanks for this.
Yet, as our power has grown, so has our peril. Today we give our thanks, most of all, for the ideals of honor and faith we inherit from our forefathers — for the decency of purpose, steadfastness of resolve and strength of will, for the courage and the humility, which they possessed and which we must seek every day to emulate. As we express our gratitude, we must never forget that the highest appreciation is not to utter words but to live by them.
Let us therefore proclaim our gratitude to Providence for manifold blessings — let us be humbly thankful for inherited ideals — and let us resolve to share those blessings and those ideals with our fellow human beings throughout the world." in the context of "Proclamation 3560 — Thanksgiving Day (5 November 1963); this was a proclamation released on 5 November for the Thanksgiving Day of 1963, which in that year fell upon the 28th day of that month." to mean that wisdom is timeless.