If you look at the United States as a system, or a big machine, it is lumbering along with nothing but basic maintenance. We have a political system that was designed during the age of horse-drawn carriages and it no longer fits the times. (Or at least it ignores the opportunities of the Internet age.) We need a system that occasionally rebuilds the entire engine of democracy as opposed to keeping the old system dusted and oiled for eternity.
I came to my hypothesis that intelligence is just pattern recognition because people who are not terribly bright have trouble understanding analogies. And analogies are just patterns.
When you are young, the most useful thing you can do is focus on your own health, happiness, and education. The world wants you to be selfish until you don't need to be that way. That's what keeps the system going. But if you maintain a high level of selfishness all of your life, your friends and family might only be pretending to like you.
I certainly agree with the first two. The last one is one of those Life Lessons that I think I didn't learn until much too late to really utilize.