Vulgarity of manners defiles ...

Vulgarity of manners defiles fine garments more than mud.
 Plautus

Quotes from the same author

Nothing but heaven itself is better than a friend who is really a friend.
 Plautus
Men understand the worth of blessings only when they have lost them.
 Plautus
Nothing is there more friendly to a man than a friend in need.
 Plautus
Let us celebrate the occasion with wine and sweet words.
 Plautus
I suspect that hunger was my mother.
 Plautus