Full Idea
Almost always we are bored by people to whom we ourselves are boring.
Gist of Idea
We are bored by people to whom we ourselves are boring
Source
La Rochefoucauld (Maxims [1663], 555)
Book Reference
Rochefoucauld,La: 'Maxims' [Penguin 1959], p.105
A Reaction
An obvious exception would be a celebrity being bored with their fans. Their very excess of interest is precisely what is boring. If two people communicate well, it is unlikely that either of them will ever be bored.