Honesty being the best policy means that being truthful, transparent, and sincere in your words and actions is always the most beneficial approach. Here's why:

1. *Builds Trust*: Honesty fosters trust with others, whether in personal or professional relationships. When you're truthful, people know they can rely on you.

2. *Integrity*: It reflects your character and integrity. Being honest shows that you stand by your principles and values.

3. *Reduces Stress*: Lying or hiding the truth can be stressful. Honesty simplifies life and reduces the burden of maintaining falsehoods.

4. *Long-term Benefits*: While dishonesty might offer short-term gains, honesty often leads to better outcomes in the long run, such as stronger relationships and a good reputation.

5. *Respect*: People respect those who are honest, even if the truth is difficult to hear. It shows courage and authenticity.

In essence, honesty is a foundation for strong relationships, personal growth, and a clear conscience.