All men profess honesty as long as they can. To believe all men honest would be folly. To believe none so is something worse.

Adams frames honesty as both a social claim and a practical test: many people will “profess” virtue while it costs them little, but circumstances reveal character. The aphorism warns against two equal and opposite errors in judging others. Naïve credulity—assuming universal honesty—invites exploitation and political miscalculation. Yet blanket cynicism—assuming no one is honest—is “something worse” because it corrodes moral judgment, makes trust and cooperation impossible, and can become a self-fulfilling justification for one’s own bad conduct. The implied ideal is a disciplined, evidence-based trust: neither gullible nor misanthropic, but alert to incentives and human frailty while still leaving room for integrity.