That's precisely what I have been saying to some people for many years when they don't seem to understand what someone (or something) really means. Everything is relative, nothing can ever be absolute (that includes your knowledge of something). The way someone perceives something heavily depends on the person (obviously) and 'his' knowledge of the situation / circumstance. That brings me to a popular saying, "A little knowledge is a dangerous thing." The saying seemed very trivial when I was a kid but now it overwhelms me when it completely fits in some of the circumstances so well. Now it reminds me of another very true saying, by Bertrand Russel, "Most people would rather die than think; In fact, most do." Nobody would deny this, at least those who are not dead yet :P Alright, thinking is good but excess of it drives you crazy. It really helps to think simple sometimes. And when exactly is that? That you must decide yourself. We are not computers, and thank god we are not. It's all up there, in your mind. Everything... everything is up there... Sounds so simple, but it's not! Definitely not. Or maybe it is. You must decide this yourself, too.
It amazes me how much every single person is capable of thinking. I like to observe people, what they do and why they do what they do :) To know a person completely would take a lifetime, or maybe just a few minutes. This reminds me of yet another saying, "Beauty lies in the eyes of the beholder."
It gets complicated at times (the thinking part, I mean), how much ever you try to keep it simple. I am not sure if one can really control what he wants to think. Well then, here I can classify thinking into two types (this makes it more complicated :x ): conscious thinking (the kind of thinking that we control), and unconscious thinking (the kind that just comes by itself, something that we don't/can't control, something that can drive you crazy or something that can lead to some new discovery, who knows!!.. :| ). All this is totally arguable. As I've said before, it's all in the mind. Damn, I won't write anymore. I'm half mad already :P
The point is: If you can't understand something your way, "नज़रिया बदलो". Just change the way 'you' look at things and everything (or maybe something, at least) may start making sense. How well it would work depends on the person and the situation both; and the complexity binding them.