What is the most important activity?

"Those who appear inactive are, believe me, engaged in far more important activity; they're dealing with matters divine and human at the same moment." -Seneca
This may be true for some people at some times, but not for all inactive-seeming people at all times.

Rather, I take Seneca's meaning to be that just because you appear to be active it doesn't mean that you are getting anything important done and in fact, oftentimes, sitting, thinking, reading, praying, meditating--these are the truly important activities that really matter, the things that make a difference in your personal life and in the world around you.

I'm all about action. But many times appearances are exceedingly deceiving.