English proverbs, idioms and expressions related to this theme.
A liar is not believed when he speaks the truth.
expresses that
All truths are not to be told.
meaning
Believe nothing of what you hear, and only half of what you see.
advices that
Fools and madmen speak the truth.
because
The truth is in the wine.
suggests that
There is no fire without smoke.
meaning that
To call a spade a spade.
Say something
Truth is stranger than fiction.
Truth lies at the bottom of a well.
The greater the truth, the greater the libel