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I mention this because people in our culture today don't think too much about the concept of "regret". And we think too much about things like blame, guilt and anger. When things go awry, I think that we often reach for states of mind like guilt, blame and anger when what we're really feeling is regret for a situation.
Here are a couple of examples of regret.
A woman leaves home very early in the morning for her early-start job. Her disabled husband is asleep, as usual, and she decides not to wake him up. Later in the day, she learns that he had a stroke in the middle of the night and she is wracked with guilt. If only she had tried to wake him up at 5:00 am, she would have realized that he was unconscious and called an ambulance.
A grandmother is looking forward to seeing her grandchildren over the weekend when her daughter rings to tell her that something important has come up and the grandkids won't be able to come over. The grandmother gets angry at her daughter and blames her daughter, even as the grandmother is telling herself that her daughter couldn't possibly have foreseen this event and that it's not her daughter's fault.
In my opinion, both of these situations are examples of regret. They are also situations where our culture is often more accustomed to reaching for the describers of "guilt" (in the first instance) or guilt's opposite number "blame" (in the second instance).
What's the difference between guilt/blame and regret?
The purpose of guilt is to alert us human beings to the fact that there is a moral or ethical choice for which we have a responsibility.
So, in the first example, if the woman had tried to rouse her husband, found him unconscious and then shrugged her shoulders and decided to go off to work anyway, then she should feel very guilty indeed; she had a moral responsibility to her husband's well-being that she abdicated.
Why is it important to understand the difference between regret and guilt/blame? Because if we understand the difference, we have a method of moral discernment. We will know how to avoid blaming people (ourselves or others) who didn't actually act unethically or immorally. We also have a process of discerning when someone does actually need to be blamed and when an action needs to be named as wrong.
And, finally, we can also learn to feel some strong feelings of regret in situations where there is no actual blame. The woman in my first example, for instance, will have strong feelings of regret. And strong feelings of "if only". And those feelings need to be mourned and cried over. What she doesn't need to feel is guilt, however.