[Mmccqrtb]

Hi, Balgore. In one sense, human existence is a mere blink of an eye (less, really) on the cosmological time scale. Physically, practically all of human history has been lived out on a tiny, pale blue dot in the outskirts of a mundane galaxy, which is only one of an uncountable number of other galaxies. From that perspective, nothing we do makes any real difference, and cosmologists now predict that the universe will continue to expand forever with the temperature approaching absolute zero.

However, no-self doesn't mean no-thing. It means that what we really are is very unlike what we think ourselves to be. No divine spark or ghost in the machine or even a homunculus running things. We're fleeting and ephemeral, but not non-existent. The mind makes importance and value. The mind makes qualities. As far as we know so far, the human brain is the only one capable of such a refined recognition of the vastness of the universe. We may eventually find more intelligent life on other planets, but for now, we're it. That, we can say, makes human experience precious. Not inherently so, but to us, at least.

So, no, don't start killing people and going wild. Nothing is without consequence. Phenomena that arise now will condition an infinity of future conditions and phenomena. We don't really have control over it, but we can do our best to set up less suffering for future conditions and those ephemeral beings that will experience them. The qualities of goodwill and compassion that wish the best for those future beings elevate humankind, and are worthwhile, no matter how fleeting and tiny our species.