τὸν τεθνηκότα μὴ κακολογεῖν → do not speak ill of the dead, speak no ill of the dead (Chilon the Spartan)
brightness: P. λαμπρότης, ἡ.
light: P. and V. φῶς, τό; see light.
Met., cheerfulness: P. and V. εὐθυμία, ἡ (Xen.).