Complexity of the human mind

Different people have different thoughts and emotions. Different personalities and thinking. So much difference and yet we could live happily ever (never?) after.
But...

4 person ; 4 types of thinking and what is the result of interaction?
Chaos,unhappiness, screwed up problems.etc

We are so different yet similar at the sametime.

Humans are the most complicated beings in the universe. One could never get to understand them. But still, we could never avoid interaction between each other. The problems would still exist and bother you.

I took about 3 terms in school and almost a life-time at home, trying to understand them. Seems as though i've failed miserably.

Indeed, humans are the most complicated creatures god has created.