Do not give in too much to feelings. A overly sensitive heart is an unhappy possession on this shaky earth.
— Johann Wolfgang von Goethe

Your most unhappy customers are your greatest source of learning.
Bill Gates unhappy quote

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How unhappy is he who cannot forgive himself.
— Publilius Syrus

It is not a lack of love, but a lack of friendship that makes unhappy marriages.
— Friedrich Nietzsche

Hope is the last to abandon the unhappy.
— unhappy quotation by Italian Proverbs