I think the entire letter would be useful when teaching the Presidency (e.g., the awesome responsibility of the office and the difference between the office and the person of the President), but I especially like the third point made by President Obama as a way to talk about fundamental principles of American government. And notice, also, the purposes of government Obama seems to assume he and Trump share in the first paragraph: “prosperity and security” are closely related to happiness/welfare and the securing of rights.
‘Read the Inauguration Day letter Obama left for Trump‘-CNN
Link to US Civitas Facebook Discussion Thread