No man can serve two masters. meaning

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commitment

No man can serve two masters.

suggests that:
If people divide their attention or efforts between more than one professions or goals, none of them will be done properly;
Nobody can be committed to two different causes, organizations or employers, at the same time.
The complete
saying of Jesus: “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.