σκληρόν σοι πρὸς κέντρα λακτίζειν → it is hard for thee to kick against the pricks, it is hard for you to kick against the goads
P. and V. σκότος, ὁ, or τό. Ar. and V. κνέφας, τό (also Xen. but rare P.), ὄρφνη, ἡ.
murkiness of the underworld: V. ζόφος, ὁ, Ar. and V. ἔρεβος, τό.