In principle, that statement makes a lot of sense. But in reality, it's worthless. I understand a great deal, and I don't accept a great deal. If you fully understand something, you can still not accept it.
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I've got spurs that jingle jangle jingle.
As I go riding merrily along.
And they sing, "Oh, ain't you glad you're single?"
And that song ain't so very far from wrong.