"The point sticks in your head: physics rules. Virtue does not triumph unless the physics allows it."
Time travelers would sometimes send themselves messages in the far future. They had to be kept someplace safe; you also need to make sure that they are not opened prematurely; that might cause a paradox.
It is an unusual package delivery system. The business model of most such systems is based on the shortness of the delivery time; this system is based on the length of the delivery time - sometimes many millennia. See also Time Capsule from the same novel.
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