He gave Odysseus a prophecy of what he had to do when he got back to Ithaca, and gave him proper guidance on how to achieve these goals.
Odysseus would like the blind prophet Teiresias to tell him how to get home safely.
Teiresias tells Odysseus to avoid the herds of Helios cattle on Thrinakia. Teiresisas saw that if Odysseus and men ate the cattle it would bring about their destruction.
Teiresias
Odysseus slits the throat of a large black sheep and lets Teiresias drink of its blood.
Teiresias does no such thing. He tells Odysseus all he needs to know.
Teiresias says Odysseus will take his revenge on these suitors and eventually kill them all either by through force or fraud.
Teiresias
Eat The Halios' Cattle
Odysseus speaks with the Theban prophet Tiresias, who tells Odysseus how to get home.
Elpenor; comrade of Odysseus. Teiresias; who Odysseus sought in Hades. Antikleia; the mother of Odysseus.
In Homer's "Odyssey," the blind prophet Teiresias foretells that Odysseus will face numerous challenges on his journey home to Ithaca. He warns Odysseus that he will encounter the Sirens and must resist their alluring song, as well as face dangers from the cattle of the sun god Helios. Teiresias also prophesies that upon returning home, Odysseus must deal with the suitors vying for his wife, Penelope, and that he will eventually make a journey to appease Poseidon, ensuring peace and prosperity for his household.
the blind prophet, teiresias