Extreme caution does no harm.

Explanation

(English-origin maxim.) Excessive caution in legal proceedings is never harmful — it is better to take every precaution than to overlook a safeguard and suffer irreversible loss.

Where this applies

• A lawyer who files every possible protective motion before a trial — even ones that seem redundant — has done nothing wrong, because excessive caution never hurts a client's case.
• A homeowner who gets three independent inspections before buying a house may spend extra money, but the extra caution cannot harm her.
• A doctor who orders additional tests just to be safe cannot be faulted, because taking every precaution protects the patient even if some tests turn out to be unnecessary.