They talk of Christmas so long that it comes.

Understand the thought

Meaning in plain English

A much-discussed future occasion eventually becomes the present one. The saying notices how anticipation and repeated conversation accompany the passage of time, without suggesting that talking makes an event happen or that every expected event will arrive.

What the words are saying

Christmas serves as the approaching occasion around which conversation gathers. The humour lies in how often people refer to it before the day is finally here. More broadly, a future event can occupy attention for a long period and then require a change from anticipation to participation or preparation. The saying does not describe speech causing an outcome. Scheduled events can change or be cancelled, and repeated mention cannot guarantee their arrival. Its useful observation concerns how time feels while people look forward: something discussed as distant may be close enough that the remaining practical arrangements now deserve attention.

Everyday example

After months of discussing an anniversary exhibition, the organisers realise that its opening week is near and confirm the remaining labels and room arrangements.

When to use it

Use it when a long-anticipated occasion has moved from distant conversation to present preparation.

Agent-assisted editorial interpretation. This explains the words; it does not by itself verify their author or earliest origin.