似是而非??

When someone ask you, 'Do you really understand that?", if you answer yes, does it really mean you're really understand it?
Sometimes, we think we really deeply understand about a matter. But, in fact, we know nothing. It;s because we used to judge a thing from the surface. Therefore forget neglect about what is actually the main point.
It seems like i know u so much. However, you are so strange for me.Even thousands or millions miles our distance.

It is alot of contradiction in our life. Cos we never go in deeply. Isn't it?