All Greek writers are unanimous in ascribing, without envy, to Egypt the priority of invention in the mathematical sciences. Geometry , in particular, is said by Herodotus , Diodorus, Diogenes Laertius, Iamblichus , and other ancient writers to have originated in Egypt.
Eat to live , not live to eat proverbial saying, late 14th century, distinguishing between necessity and indulgence; Diogenes Laertius says of Socrates , 'he said that other men live to eat, but he eats to live.
According to Diogenes Laertius, Thales believed that “water constituted the principle of all things.”
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