Why is an ultimate goal called a 'Holy Grail?'
Briefly

The legend of the Holy Grail, as we know it today, originates from 15th-century Britain in "Le Morte d'Arthur" by Thomas Malory, detailing King Arthur and his knights.
In the Arthurian legends, the Holy Grail serves as a mystical object offering abundance and healing, symbolizing a quest that reflects values of courage, purity, and chivalry.
Sir Galahad’s quest for the Holy Grail emphasizes the ideals of purity and virtue, portraying him as the destined knight to achieve the seemingly impossible.
The term 'Holy Grail' has evolved beyond its original context, now used to describe any challenging goal or aspiration across various fields, including science and collectibles.
Read at The Conversation
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