52As regards, more specifically, the question whether an internal rule of a private undertaking prohibiting the wearing of any visible sign of political, philosophical or religious beliefs in the workplace constitutes direct discrimination on the grounds of religion or belief, within the meaning of Article 2(2)(a) of Directive 2000/78, the Court has already held that such a rule does not constitute discrimination of that sort provided that it covers any manifestation of such beliefs without distinction and treats all workers of the undertaking in the same way by requiring them, in a general and undifferentiated way, inter alia, to dress neutrally, which precludes the wearing of such signs (judgment of 14 March 2017, G4S Secure Solutions, C‑157/15, EU:C:2017:203, paragraphs 30 and 32). Since every person may have a religion or belief, such a rule, provided that it is applied in a general and undifferentiated way, does not establish a difference of treatment based on a criterion that is inextricably linked to religion or belief (see, by analogy, with regard to discrimination on the grounds of disability, judgment of 26 January 2021, Szpital Kliniczny im. dra J. Babińskiego Samodzielny Publiczny Zakład Opieki Zdrowotnej w Krakowie, C‑16/19, EU:C:2021:64, paragraph 44 and the case-law cited).
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