Always good to know as much Spanish as possible.
Are you having trouble understanding a client or a colleague because you only know English? Have you attended a Spanish class, but for some reason you can't recall what you have learned? Do you want to converse in Spanish, so you can communicate better with people who speak the language?
Being bilingual these days is an important job qualification, especially for the medical, education, and social service industries. It's truly a huge advantage for someone who already possesses the skill, and that's why you should start learning for your own benefit.