Ummmm it’s got more water in it???
I think it means that you are you. Your actions represent yourself and you are the only one who can make decisions for yourself. If you go and get arrested for stealing, that's who everyone knows you as. So, therefore, you are what you do, as in you are who you act like.
Coparing is to look at the similarities, and cotrasing is looking at the differences.
Hope that helps