Alchemy may be compared to the man who told his sons of gold buried somewhere in his vineyard, where they by digging found no gold, but by turning up the mould about the roots of their vines, procured a plentiful vintage. So the search and endeavors to make gold have brought many useful inventions and instructive experiments to light.
The point
Even failed pursuits of a lofty goal can yield practical, unexpected benefits along the way.
