We all would have heard this "Change is the only unchanging thing" or "Change is inevitable". While this is true to the core, what is not being addressed here is the direction of change and the reason for the change.
Some people might say that if the change is for the "good", the reason is not relevant. This might be true for situations but not for persons. And again "Good" is relative and my "Good" might be "Bad" for you and "The Worst" for a third person. So although it serves the political purpose of drawing attention or diverting attention, this kind of statement does not make a whole lot of sense.
This is very important for persons. If person changes or has to change, apart from the inherent reason(trigger) for change, there must be a logical reasoning for the change; Even if there is no logical reasoning the change may be effected. At a later point of time the change should be look out of place or unnecessary. Also it is said that we should not change ourselves to match up with each statement of "Good" and "Bad"; looking back after sometime you may not be able to recognize yourself and understand how you came from being you to this unknown person. As per me, this is the worst thing that can happen to a person. Again some of these "Bad" qualities is what makes You the real You. If there was an example of a Perfect Good Person and every person is pretty much a clone of this Perfecto person, then we need have a world or a society. Rather it will be like a set of machines who know only the right way of things. Also, there would be any Bad to contrast the Good against.
So I would say, for our own good, be yourself you can be what you are..instead of what someone else wants you to be...