How to Behave and Why

Every time we tell a lie we mix ourselves up more.
After a while almost no one will believe us —
but worse than that —
We can't believe ourselves, or anyone else, because we don't really know what the truth is
any more than a penguin
and that is a stupid way to live
As anyone can tell you.

—Munro Leaf in How to Behave and Why (1946), summarizing 2016. (You may recognize Leaf as the author of The Story of Ferdinand.)