More than 99.99% of facts are not and will never be useful to even a single person.

Being divorced does not necessarily make one’s advice on marriage useless … or useful.

We are not as important to most people as we are to ourselves. As a matter of fact, we are—to most people—not important at all.

As useful as an unhappy artist. As useless as a happy philosopher.

Useful information badly written is way more valuable than useless information well written.

There is not necessarily a correlation between how much time or effort a thing demands and how important or useful it is.