Who says the following and why She hath and in that sparing makes huge waste For beauty starved with her severity Cuts beauty off from all posterity?

The lines are spoken by William Shakespeare in his poem "The Passionate Pilgrim." The speaker laments that a woman’s excessive restraint in love leads to a waste of her beauty, suggesting that by withholding affection, she ultimately deprives future generations of her beauty through lack of offspring. The poem critiques the idea that severity can enhance beauty, arguing instead that it diminishes it by preventing the continuation of her lineage.