A couple of ideas are: All men are created equal. All men have basic human rights given to them by God. The only reason to have a government is to protect these basic human rights, which Jefferson lists as "life, liberty, and the pursuit of happiness."
I’m pretty sure he means he doesn’t want his poetry to end with him dying, but more of, he hopes his poems continue to give strength to those who read them, recite them. I hope this helps!
