90:4.9
The Greeks were the first to evolve truly rational methods of treating the sick. Both the Greeks and the Egyptians received their medical knowledge from the Euphrates valley. Oil and wine was a very early medicine for treating wounds; castor oil and opium were used by the Sumerians. Many of these ancient and effective secret remedies lost their power when they became known; secrecy has always been essential to the successful practice of fraud and superstition. Only facts and truth court the full light of comprehension and rejoice in the illumination and enlightenment of scientific research.