Full Idea
Falsehood is bad and reprehensible, while the truth is a fine and praiseworthy thing; accordingly the sincere man, who hold the mean position, is praiseworthy, while both the deceivers (the boaster and the ironist) are to be censured.
Gist of Idea
The sincere man is praiseworthy, because truth is the mean between boasting and irony
Source
Aristotle (Nicomachean Ethics [c.334 BCE], 1127a29)
Book Reference
Aristotle: 'Ethics (Nicomachean)', ed/tr. ThomsonJ A K/TredennickH [Penguin 1976], p.165
A Reaction
An interesting and surprising claim - that truth is not an abstract Platonic absolute, but a human virtue seen as a mean between two extremes of falsehood (excessive assertion and excessive denial). Truth is a human value.