In the fourth paragraph he says
I would like to take this opportunity to dialogue with the many thousands of men and women who strive each day to do an honest day's work, to bring home their daily bread, to save money and - one step at a time - to build a better life for their families. These are men and women who are not concerned simply with paying their taxes, but in their own quiet way sustain the life of society. They generate solidarity by their actions, and they create organizations which offer a helping hand to those most in need.
We are concerned not only with the welfare of our families but with our society and humankind as a whole. [For an explanation of solidarity in Catholic Social Teaching see this.] Many who are attentive to social needs support and are involved in community based organizations (CBOs), nonprofit organizations, and non-governmental organizations (NGOs). CCOP's Social Justice Committee is a good place to meet concerned parishioners and find ways to help.
Next the Pope says,
I would also like to enter into dialogue with the many elderly persons who are a storehouse of wisdom forged by experience, and who seek in many ways, especially through volunteer work, to share their stories and their insights. I know that many of them are retired, but still active; they keep working to build up this land.
Pope Francis sees the elderly as a storehouse of wisdom. He also commends those although retired (or possibly disabled or otherwise limited in one way or another) do what they can to build up society.
Next he says,
I also want to dialogue with all those young people who are working to realize their great and noble aspirations, who are not led astray by facile proposals, and who face difficult situations, often as a result of immaturity on the part of many adults. I wish to dialogue with all of you, and I would like to do so through the historical memory of your people.
Thus the Pope voices his concern for young people, recognizing their aspirations and also the pitfalls they face in trying to fulfill their goals.
What does the Pope mean when he says he wishes to dialogue with all of us and would like to do so "through the historical memory" we have as members of our society? He seems to have made several references to our legacy as people "in the land of the free and the home of the brave". He is calling us to remember our history as founders of a constitutional democracy that has thrown off slavery, created a rule of law, welcomed immigrants and led the world in the expansion of human rights.
As to the Pope wanting to dialogue with us, he actually has a Twitter account and all of us can write to him and read what others have said to him. Beyond that, we can enter into conversations with each other and with strangers and build up a society of mutual respect and concern for one another.
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The Pope also addresses our nation's law-makers:
Your own responsibility as members of Congress is to enable this country, by your legislative activity, to grow as a nation. You are the face of its people, their representatives. You are called to defend and preserve the dignity of your fellow citizens in the tireless and demanding pursuit of the common good, for this is the chief aim of all politics. A political society endures when it seeks, as a vocation, to satisfy common needs by stimulating the growth of all its members, especially those in situations of greater vulnerability or risk. Legislative activity is always based on care for the people. To this you have been invited, called and convened by those who elected you.
Thus the Pope states a cornerstone of Catholic Social Teaching that is widely accepted by ethicists the world-over: "the pursuit of the common good ... is the chief aim of all politics". Legislation needs to "satisfy common needs" and show "care for the people". Perhaps we as voters should ask our legislators to hold themselves to a higher standard.
The Pope then invokes the figure of Moses to remind law-makers of "the need of peoples to keep alive their sense of unity by means of just legislation" and their duty to "protect ... the image and likeness fashioned by God on every human face".
