No man can serve two masters 英文諺語
No man can serve two masters 一人不能事二君（一馬不能被兩鞍）
You cannot work for two different people, organizations, or purposes in good faith, because you will end up favoring one over the other.
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No man can serve two masters A man with two employers cannot be faithful to both. Nor can a man support two conflicting causes. The source is Matthew, vi, 24: ‘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 despite the other. Ye cannot serve God and mammon.’