It is based on Proverbs 4:18, which in their New World Translation of the Bible reads, "But the path of the righteous ones is like the bright light that is getting lighter and lighter until the day is firmly established."
Tshanduko dzo raloho dzi tendelana na zwo ambiwaho Bivhilini kha Mirero 4: 18: "Hone gondo ḽa vhavhuya ḽi nga tshedza u naka, tshine tsha ḓi tshena tshi tshi ya, ḽa vhuya ḽa tsha."