Full Idea
Badness always manifests in destruction and corruption, while goodness always manifests in preservation and benefit.
Gist of Idea
Bad is always destructive, where good preserves and benefits
Source
Plato (The Republic [c.374 BCE], 608e)
Book Reference
Plato: 'Republic', ed/tr. Waterfield,Robin [OUP 1993], p.364
A Reaction
Suspicions of tautology in this one. Can we have any concepts of good or bad which are not linked to desirable or undesirable outcomes?