Readers who believe they practice this virtue: 88.5%
You have to pick your battles. Knowing when to keep quiet can help you be heard when you have something truly important to say. Speaking too often may devalue your comments when they are truly important.
It is also important to your professional relationships to respect the ideas of your coworkers even when you may not agree with them. Make sure that when you do decide to speak up or offer advice, you are doing it with respect.