Useless -Sanskrit subhashitam

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वॄथा वॄष्टि: समुद्रेषु, , वॄथा, तॄप्तेषु भोजनम् | 

वॄथा दानं धनाढ्येषु, , वॄथा दीपो दिवाऽपि च ||

Rains over the sea are not of any use. Food for one, whose stomach is full, is waste. What's the use of donation to an affluent? Also, lighting a lamp during day is useless.