“One fact strikes us at the outset; often one and the same word is...

Ta agatha (Greek) goods, wealth; to agathom, the good.
Bona (Latin), goods; bonum (Latin) the good.
Les biens (French) goods; le Bien, the good.
Orthos (Greek), rectum (Latin), derecho(Spanish), droit (French), etc. have the double meaning of being in a straight line and that of Right, Justice.
Here again are other examples chosen in the Greek language: Kalon, arrow, javelin, beauty, virtue; phren, heart, entrails, reason, will; kakos, man of plebeian origin, base, wicked, ugly; kakon, vice, crime. The word kakos contributes to the formation of a series of terms, employed for what is vile and evil; kakke, excrement; kakkia, vice, baseness; kakotheos, impious; kakophonia, unpleasant sound, etc.
The fact is worth attention, although little noticed.” -Lafargue

Proto-Indo-European root meaning "to be strong."
