Wiktionary
honesty is the best policy
prov. honesty is the most honorable and fulfilling way to live one's life.
Usage examples of "honesty is the best policy".
Hardstone's advice fell into three major divisions: (1) Hard Work Never Hurt Anybody, (2) the Will to Win, and (3) Honesty Is the Best Policy.
You say, but do not believe, one of your oldest tenets: honesty is the best policy.
I just want you to remember that honesty is the best policy, and ladies do not tell lies.