5. ὃς μὲν γὰρ κ.τ.λ. A second instance is given—scruples as to the observance of days. Here it is almost inevitable to think of Jewish influence (cf. Col 2:16): and all the more remarkable is the detached way in which the case is treated: as long as such observance is not made occasion for judging others, it is open to individual choice.
κρίνει—παρ'. No exact parallel: = judges or esteems one day as superior to another for certain purposes: and perh. distinguishes one day from another. Cf. on Rom 12:3.
πληροφορείσθω, be assured. Cf. Rom 4:21; Col 4:12 : alibi 2Ti 4:7; Luk 1:1.