Hebrews 13:8 Jesus Christ is the same yesterday and today and forever.
Why does it matter that the Jesus Christ of today be the same as the Jesus Christ of yesterday and tomorrow? Let me try to put the significance of each time period in a single sentence.
Yesterday: It is crucial that Jesus Christ be the same yesterday as he is today because yesterday is when Jesus Christ showed us in history what he is really like.
Today: It is crucial that Jesus Christ be the same today as he was yesterday because today is where we have fellowship with him and relate to him as the person we know by reading about his life and work yesterday.
Tomorrow: It is crucial that Jesus Christ be the same tomorrow as he was yesterday and today because all our hope for everlasting joy hangs ultimately on relating to him, not just his gifts.