There is nothing quite so satisfying as the tearing up of paper.
One thing more satisfying than tearing up paper is the physical act of using a paper knife.
The pleasure of using a letter opener was all bundled up in the excitement of receiving a letter in the post. I loved opening those envelopes addressed to me!
Interestingly, the letter A is not capitalised in the term, “gum arabic”. In the process of checking this I found a really well-researched article all about gum arabic. The use of gum arabic predates the Dark Ages by a long shot.
I got the impression that it was considered classy to have mastered the art of slitting the top edge of an envelope open with one flourish of the paper knife.
If you were not sentimental you would discard the envelope. This is where the bit about tearing paper becomes relevant.