Our senses are constantly filtering data which we use to decide what we’ll do next. The fact that humans are so predictable is a testament to their ability to do this effectively.
If you boil that down for long enough, our lives are nothing more than a long string of decisions, actions and inactions.
Is this depressing? Maybe. Reductionist? Definitely. Could it be useful? I believe so.
There are a million reasons we might choose to do one thing over another; we have ethical frameworks to pass quick judgement on wrongdoings of others; a moral compass to ensure that we align ourselves with internal principles of right and wrong; a relentless self interest which keeps us safe and ensures we can pass down our genes; and every now and then, we just do stuff because it feels good.
The mental gymnastics our brains perform while making these decisions are but small parts of the lifelong games we use to define ourselves.
In the same way that ‘you are what you eat’ is true of the body, ‘you are what you do’ is true of the soul.