For one who, as I believe I've expressed before, doesn't enjoy change, this has been a difficult concept to come to grips with. The passage of time inevitably means change.
My students, for example, will always change. I will have them for a certain period of years, and then they will be gone, moving on with their lives, leaving me behind.
My friendships will change. People drift out of my life as their paths take them to other places, and others drift in as their paths bring them my way.
My ideas will change. But usually I still agree with myself, so that's okay:)
But some things are constant. My former students are always and forever my former students, and I love that! My family's love is constant. There is constant learning going on, whether about how to deal with change, or how to relate to others, or what life is really about, or who I am, or who God is...
And most of all my Father is constant. "Change and decay in all around I see; Oh Thou who changest not, abide with me." His love is constant, His goodness is constant, and His plan for my life, no matter what seems to change from my perspective, is a constant progression toward Him.