Whole Sort Of Genl Mish Mash
The one, most noticeable, constant in my life seems to be the many demands on my time.
To answer your question, I think it is often very difficult for us, being "creatures of the present," to see what we are calling "constants," especially when our own experiences are involved. So I think there are two parts to your question: (1) are there constants in our personal lives and (2) are there constants in our social community.
Regarding (1), the extremely good feeling I had recently while dancing with my wife at a friend's wedding and the extreme heartache I felt a few years ago as my wife an I struggled with the education system might seem, in isolation, to be an example of how nothing remains constant. But on reflection, I would argue against such a conclusion since our commitment to one another "for better or for worse" was the constant that allowed us to celebrate our marriage and take our parental responsibilities to our children seriously. Emotions are certainly not constant but, in many if not most cases, commitment to family is far more stable. At the time we agonized over tough decisions, our commitment to one another didn't seem to stabilize a highly uncertain time of our lives, but in hindsight it was that very commitment that got us both through it. It simply took us some time to realize the effect of our commitment on the ultimate result of our efforts.
Am I making any sense?
Regarding (2), I think history demonstrates that moral standards seems to shift from generation to generation. Several centuries ago, it was not unheard of for an adult male to marry a young woman as soon as she was able to bear children (sometimes 11 or 12 years old). Today we call it statutory rape.
Another example might be slavery in the United States. A "strict constructionist" of the US Constitution is a misnomer unless the so-called strict constructionist also recognize that our Founding Fathers upheld the Constitutionality of slavery. Even after emancipation, it took 100 years for the Civil Rights Act to codify the civil rights of African Americans in the United States. But I think this is actually a defense to the notion that societal morals change relatively slowly. Philosophy seems to first impact education and art, then work its way to policymakers and judges, then finally to the general population. As we see in the case of slavery, it took hundreds of years to get from a thriving slave trade to an affirmation of the civil rights of racial minorities.
I think it is fair to say that all things human are inconstant, but it is also fair to say that some human behavior remains very consistent over time. An example that may be less a shade of gray than statutory rape or slavery could be murder. In virtually every society, the wrongful killing of another human being was deemed punishable by whatever authority was in place in any given culture at any given time.
Another matter that I haven't touched on and, unfortunately, don't have the time at the moment to explore further, is the subject of God's role in our personal lives and in history. Suffice it to say that I believe suffering presents us with an opportunity to worship. Looking back on the trying time I had getting my son the education he needs, I recall questioning why God could allow such horrible, cruel events to take place, but from my perspective here and now, I see clearly that this time of suffering resulted in far more good than I could have ever imagined.
The best book I've ever read on the subject was C. S. Lewis's "A Grief Observed." It is Lewis's memoirs following the death of his wife. I think it illustrates my points far more skillfully than I can possibly do myself.