I guess if you consider how the concept that God created everything we can see and also what we cannot and you layer on top of this the fact it was accepted as literal truth (and still is by some people today) for hundreds of years then it has to rank as one of the most important sentences.

The fact that it doesn't strike you (or indeed myself) as of great importance is understandable given the times we live in but for the many generations that have come before.... Can we really say that a witty Samuel Clemens quip or even a multi-layered David Foster Wallace quote can be said to be in the same league in terms of the impact or importance they have had on the world around us?

Matthew 7:12 "So in everything, do to others what you would have them do to you, for this sums up the Law and the Prophets." Is a good one, the problem I have always had with it is its implicit statement that the source of right and wrong is within each of us and overrides and form of more universal law. Which is fine until you meet a psychopath who has a different idea about the whole "do unto others" thing.