Theists and Atheists can you give some feedback on how to word this project idea? (Details inside)

For one of my classes I have an assignment inspired by this clip from the movie City Slickers. Each of us has to come up with one thing that we think of as the secret of life. The first thing I thought of was the idea that we are all part of something greater than ourselves. Being a theist, I think it would be simple to couch the idea theistic terms but I honestly believe the idea applies to theists and atheists. I want it to be an idea that everyone, theist or atheist can relate to. Do you have any thoughts on how I could present it so it won’t offend and will in fact appeal to the most people?