Once you get what you want, you start to get used to it, so your happiness returns to its regular level.  Also, you no longer have something to look forward to, and you may find it is not as good as you thought it would be.

Whether wanting or getting, you are serving your ego, and never finding contentment.  One must appreciate the moment.  This is what I have been learning recently from Taoism/Buddhism/mindfulness.  :)

A thoughtful saying, as is explained above.

Like any philosophical sayings, however, it can be both true and not true depending on how it is viewed.

Or, we might say there is no absolute truth in this world, outside of a conceptual framework like mathematics.

Anyway, this "getting" really has serious consequences - look at how this great planet is being trashed almost beyond repair now.

That's a philosophic one...

And I totally agree with it. After getting what you want you have to set another goal. Without any goals there is no real life, no striving, no dreams and no motivation. 

i think it means that if we don't look for what we wanna get it's kind of tragic because we are not as i just said looking for the things that we wanna get in life. in the other hand i don't think is a tragic getting it because when you complete something you have to keep looking for more.