In Feynman's The Meaning of It All he writes,
[...] What, then, is the meaning of it all? What can we say today to dispel the mystery of existence? If we take everything into account, not only what the ancients knew, but also all those things that we have found out up to today that they didn't know, then I think that we must frankly admit that we do not know. But I think that in admitting this we have probably found the open channel.
Admitting that we do not know, and maintaining perpetually the attitude that we do not know the direction necessarily to go permit a possibility of alteration, of thinking, of new contributions and new discoveries for the problem of developing a way to do what we want ultimately, even when we do not know what we want. [Bold mine.]
In a nutshell, Feynman is saying that the good is defined by the possibility for significant change. Good choices make the future universe more interesting. Poor choices make it more boring.
What is the name of this kind of ethics? Are there other similar ethical systems I can read about?