Belief in spirits or souls isn't required for a harmonic or philosophical life. I'm an atheist, but not a cynic; I believe in a calmer path to living.
I ate an egg this morning, I don't think about it much after that but, it's energy/matter will become part of me. I can't stop that process through thought, it's automatic. That egg changed my life; I'm a different person, weigh different, have different cells, have written a different post here, so on so forth, just because of an egg I ate. In 20, 30, 40 or more years, it will still have physically and mentally changed me because I chose to eat an egg this morning. When I die, even my body will deposit a different footprint to and from the earth, simply because of that egg. Everything is connected and all events effect all other events. Through the chain of events, everything, whether it be inanimate, animate, or even sentient, will have caused a permanent change in the timeline. That change is forever, so everything will last forever, atleast as changes to the universe. The idea that everything is connected and all choices and actions create a cumulative history that is forever, is very calming to me. I am immortal; even my ideas and actions will have a nearly if not completely everlasting effect on the rest of humanity and the universe in general. If you can consider these contributions to be the "soul" of an object or even an idea, then all things have souls and they are immortal.
Don't get me started with the plate I ate the egg on.