Three children have become adults since a phone call with Jo Rowling, containing one small clue, persuaded me that there was more to Snape than an unchanging costume, and that even though only three of the books were out at that time, she held the entire massive but delicate narrative in the surest of hands.
Truth is eternal, unchanging, though circumstances may and do operate to give a different colour to it, in our view, at different times. And truth will prevail, and those who do not yield to it must be destroyed by it.
Faith is a dynamic and ever-changing process, not some fixed body of truth that exists outside our world and our understanding. God's truth may be fixed and unchanging, but our comprehension of that truth will always be partial and flawed at best.
If we pursue this matter further, we shall be told that the stable object is unchanging under the impact or stress of some particular external or internal variable or, perhaps, that it resists the passage of time.
Be still; quietly remember the presence of and within yourself, and you will know, without thinking, that while all around you everything changes, within you lives something unchanging.
Only when we realize that there is no eternal, unchanging truth or absolute truth can we arouse in ourselves a sense of intellectual responsibility.
Facial recognition software is already quite accurate in measuring unchanging and unique ratios between facial features that identify you as you. It's like a fingerprint.