This Divining skill is better suited to NPCs than PCs, although, with a little effort on the part of the GM, a PC oracle might be made to work in a campaign. Characters might be granted oracular powers temporarily as a blessing or as part of a larger divine plan.
The oracle becomes briefly possessed by the deity and delivers a verbal message while in a trance. The oracle generally remembers little or nothing of the prophecy after regaining consciousness and oracular utterances are invariably obscure and difficult to interpret.
See Divining for more detail on divinations possible as an oracle.