[Wiser now]

Interesting, some years ago a pastor I very much respected did say the “eye of the needle” was a gate in the Jerusalem wall that was just large enough for an *unloaded* camel to pass through.
The analogy still makes sense.

[Calvin Locke]

From my Parochial schooling, the "needle" was the night entrance to the walled city after the main gates were closed for the evening.

Just big enough for late caravan arrivals, but small enough to quickly close and barricade against marauding hordes.

[Rebelbase]

I’ve heard that one too.