Our modes of being are determined by our modes of becoming. In essence, becoming is being as that is the process we experience daily.
I tossed this idea from German philosopher Oswald Spengler (1880-1936) at my students this morning in my Acoustics of Music class. I asked them what the difference between becoming and being was? What were they doing when they practiced every day on their respective instruments? The answer I was looking for was simply "becoming musicians." Competent musicians, good musicians, professionals to be sure, but musicians. And, in essence, there is never a true point of arrival as a musician. One can never practice enough; there's always more to accomplish. Therefore, thinking back to Spengler, life is always a becoming, never quite an arriving.
This isn't a depressing thought to me. It's a thought of hope: hope to become better and better (maybe as a musician, hopefully as a person), to keep thinking, striving, reading, and tweaking the art of becoming.