When I was offered “free” goodies by leftist candidates; when people told me they were entitled to others’ money or time; when parasites of various kinds reared their ugly bloated heads, I thought TAANSTAFL, because that’s the ultimate truth of the universe. There is never something for nothing.
Parasites. Appropriate.
I also read Heinlein as a kid. ‘Time Enough For Love’ was my favorite.