My pop (almost 90) slaps me with that quote reminder frequently. It’s an important philosophical idea I believe in. It goes back to ancient Greece Philosophy which makes you able to question everything you think you know.

But that doesn’t have to be a bad thing! it can be looked at as the mind’s ability to be open to new ideas, yet still grounded in certain realities our world
is based in. I even use it as a reminder of my spiritual beliefs because the idea that you “don’t know” is a part of accepting your place in God’s plan.

Sorry to philosophize in front of everyone. Point is, as dark as things feel now, things WILL go on. Try to think of the possibilities of the future unknown rather than destroying yourself about the unknowns of the past. My sister is going through a similar thing right now with her husband. That’s what I tell her when we talk.