Change always presupposes a denial of the past, and an affirmation of the future which has taken past's place as "now."
It amounts to a betrayal, a denunciation, a contradiction.
Whether it is the "evolution" of one's ownmost thoughts,
or the departure of a child from the parent,
or the transformation of an organization's ideals,
some pain is always present as the past "dies" and is "killed" by the future.
This may be experienced either on the axis of expressions of "what is" or that of "what ought to be,"
on the axis of either facts or values.
Whether this is to be understood as an wholesale enmity, depends on what those of the past hold dearly.
And it is noble to hold dearly those things that have some internal worth.
But if the things we hold dearly our ourselves in no other qualified sense,
then that is pure selfishness, pure self-ish-ness, pure self-ness, pure ego-ism.
It has no claim to self-less-ness, since it is the direct opposite of it.
One must always be aware on which side of this fine line one stands,
so that one might not experience the pain of death from such a break,
but experience rather the whole process of a defined identity evolving to become its better.