ऊषरेषु च क्षेत्रेषु यथा बीजं हि निष्फलम्।
उपकारोऽपि नीचानां कृतो भवति तादृशः॥
Just as seeds sown in barren land remain fruitless, any favor done to vile people yields no result. Kindness is wasted on the unworthy.