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Particularly if it become more hard to choose when at a moment both are important to you !
First of all every employees' duty is to work hard by dedicating his time and efforts honestly for the progress of any company/organization/establishment as he will be being paid for what he works.
Secondly, he must always keep in mind that he is just an employee of that particular organization; so in this case he has to keep aside his personal interest and give priority to organization interest which will benefit him too later.
Conflict between organizational and personal interests can be best handled via proper time management. Nevertheless, sometimes self-interest intervenes during office hours. In such cases, an employee - to be ethical - should compensate the time spent on self-interest.