The Bible, Thomas Jefferson, and probably you thought JFK who actually plagiarized at least two others:

"It is now the moment when by common consent we pause to become conscious of our national life and to rejoice in it, to recall what our country has done for each of us, and to ask ourselves what we can do for our country in return."

Supreme Court Justice Oliver Wendell Holmes, in a Memorial Day address is 1884

"We must have a citizenship less concerned about what the government can do for it and more anxious about what it can do for the nation."

President Warren G. Harding at the 1916 Republican convention

I note that before JFK, it was a Republican that made the "ask not" allusion. Probably why JFK didn't cite him and the lib press gave him a big pass.

However Holmes also said:

"I have no respect for the passion of equality, which seems to me merely idealizing envy. "

So much for your egalitarian mush.