When you overstate, readers will be instantly on guard, and everything that has preceded your overstatement as well as everything that follows it will be suspect in their minds because they have lost confidence in your judgment or your poise.
Do see “The Only Writing Tip That Really Matters“, quoting The Elements of Style, by William Strunk, Jr. and E.B. White, at Evan Schaeffer’s The Trial Practice Tips Weblog.
Blarney Castle, near Cork, Ireland