Resources — We’ve been warned about these limits many times.
Capability — Do we have what it takes?
Lifespan — Will we live to see it?
People — Well there’s no shortage of those, anyway. (Or is there?)
Ideas — Let’s not run out of the Ulitmate Resource.
Freedom — What if we have it all except for the ability to choose?
Will — What if we just stop caring?
Are limitations something we ened to accept or to overcome? Which of these is most likely to impede our progress?