The great oracles of Zeus were at Olympia, where the answers were given from signs observed in the sacrifices offered, and at Dodona, where they were given from the sound of the rustling of the leaves in the sacred oak-tree. But the greatest oracle in all Greece was that of Apollo at Delphi. It was at Delphi that Apollo had fought with and slain the Python, and it was thought that he specially delighted to dwell there, and had himself chosen it as the place where he would make known his will. Here methinketh to stablish a right fair temple, to be a place of oracle to men, both they that dwell in rich {58} Peloponnesus and they of the mainland and sea-girt isles, seeking here the word of wisdom; to them all shall I speak the decree unerring, rendering oracles within my wealthy shrine.[18] Delphi had been sacred to Apollo ever since these legendary days, and a great shrine and temple was built there in his honour. When a Greek came to consult Apollo, he had first to offer certain sacrifices, and he always brought with him the richest gifts he could afford which were placed in the treasury of the god. Then he entered the temple and placed his request in the hands of a priest, who took it into the innermost sanctuary and gave it to the prophetess, whose duty it was to present the petition to the god himself and receive the answer. In ancient times it was believed that a mysterious vapour arose in this sanctuary through a cleft in the rocky floor, and that this vapour, enveloping the prophetess, filled her with a kind of frenzy in the midst of which she uttered the words of the answer given her by Apollo. This answer was written down by the priests and often turned into verse by them and then taken out to the enquirer. Sometimes these answers were quite plain and straightforward, such as the one which has remained true through all the ages. It was the oracle from Apollo at Delphi which said of the poet Homer: "He shall be deathless and ageless for aye." But sometimes the answers were like a riddle that required much thinking over to understand, and {59} sometimes they were so worded that they might mean either of two things, each the opposite of the other! The oracle at Delphi was frequently consulted by the Greeks at great crises of their history, and it had great influence. It was the priests who in writing down the answer really determined its nature. They were men who were in constant touch with distant places, they had had much experience with human nature, and they were well fitted to give guidance and advice in all kinds of difficult matters. The oracle at Delphi was thus a power in the worldly affairs of the Greeks, but it was more than that, it was also a source of moral inspiration. It encouraged all manner of civilization and the virtues of gentleness and self-control, it marked the great reformers with its approval, it upheld the sanctity of oaths, it encouraged respect and reverence for women.