As I said at the time …
Yes, your substantial, thought-filled, and most welcome letter arrived. You fire off in so many facets I’m tempted to send off separate replies, one in each envelope. Or maybe try subheads instead, to be read in any order you desire. But that would appear too formal for this ongoing conversation.
Yes, one insight or comment stirs a dozen others – I’ve been talking to you in my daily commute, and now maybe some of that ought to reach paper and then your mailbox.
All these years later!
Jnana's Red Barn 
Answering old snail mail? Interesting…
You never know what you’ll find when you rummage around in an old barn …
I like to ramble round old buildings