You are an irrational person. Yes, you.
That’s not an insult. If you can read this, you’re a human being — and that makes you irrational. In fact, I believe — in all seriousness — that every human being is just a little bit insane. Some form of insanity is a universal “birth defect” among us.
One of the biggest mistakes we make in life is assuming we’re rational. What’s worse, we notice that other people seem irrational and stupid, but almost all of us believe we’re the exception. My way of looking at the world is right and rational. Your way is wrong and irrational. (You probably have evil motives, too.)
You are the hero of your own story. In your own mind, you believe you’re making rational and smart and sane decisions. You believe you have good motives, at least within the context of however you’ve justified your own actions.
I do exactly the same thing. And our mutual blindness about this whole charade leaves us with warped perceptions of the world around us — and of each other.

Why am I shocked that a friend’s happy news makes me feel envy?
My Twitter suspension is reminder that free speech is under assault
Goodbye, Amelia (2000-2013)
Slow culture changes might mean skin color matters less in future
Biases teach us what to expect, but we often turn out to be wrong
Governments can recognize rights, but no government creates rights
There’s a lot to complain about, but miracle is so much goes right
Sex is everywhere in our culture, but we’re starved for intimacy
Epiphany: Was it so bad that I used to work toward perfection?