change or not to change

You can never understand a person completely how much you may try. Every time we deal with people we think after wards- he could have done this way, why did not he said this etc. We differ a lot in our way of thinking, doing things. Perhaps this is justified also because every person is a different entity, thinks differently, acts differently. And of course we should respect individual’s identity. As they say-“the beginning of love is to let those we love be themselves and not twist them to fit our own image; otherwise we will be loving only the reflection of ourselves in them.” then why do we try to change them. Why is there so much of a fuss about change. ‘Change is the only constant thing in world’ goes the old adage. Isn’t it a contradiction in itself? But if the world is up and running on certain principles, then it is for sure that there can be no contradiction what so ever. This contradiction problem has to be solved.