Be conservative in its ...

Be conservative in its sending behavior, and liberal in its receiving behavior.
 Jon Postel

Quotes from the same author

TCP implementations will follow a general principle of robustness: be conservative in what you do, be liberal in what you accept from others.
 Jon Postel
But as soon as we got that higher speed access to the home there?s going to be a tremendous crunch on the backbones for a much higher speed bandwidth. People really ought to be planning for that.
 Jon Postel
There was one issue on which there seemed to be almost unanimity: the Internet should not be managed by any government, national or multinational.
 Jon Postel