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serve two masters
To simultaneously tend to or support or devote oneself to two different—often conflicting—responsibilities, pursuits, ideas, or people. It comes from the Biblical phrase, "No man can serve two masters." You need to decide if you are married to your wife or to your work because you simply cannot serve two masters.
serve two mastersFORMAL
If a person or organization tries to serve two masters, they try to be loyal to two opposing principles, beliefs or organizations. An organization such as the BBC can either make a profit or provide an excellent public service. It cannot, however, be asked to serve two masters. Note: This expression is used in the Bible. In the Sermon on the Mount, Jesus says: `No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other.' (Matthew 6:24, Luke 16:13)