"It's easier to ask forgiveness than it is to get permission." - Grace Hopper
Some places say Henry Ward Beecher (brother of Harriet Beecher Stowe). If I had to guess, though, it's hundreds or thousands of years old.
https://en.wikiquote.org/wiki/Grace_Hopper
Disney used it in a slightly modified form: "Better to beg forgiveness than to ask permission."
http://freakonomics.com/2010/06/24/quotes-uncovered-forgiven...
Telling me that it's just a sentence isn't persuasive in any way. Showing me something mostly similar from before 1986 would do a lot more to persuade me.
Oh, you don't know who the Beechers are. They're from the 1800s.