Sōþ and Trēowþ

English uses “truth” for several related things: an accurate statement, honest speech, good faith, or fidelity to another person. The older words sōþ and trēowþ help us attend to those differences. Sōþ centres on what is real or the case; trēowþ brings trust, pledged faith, and reliability into view. Their historical meanings overlap, so they should not be treated as two sealed categories or a complete ancient ethical system.
The distinction becomes useful in ordinary judgement. A witness may speak sincerely and still be mistaken. Another person may use accurate details to produce a false impression or betray a confidence. Assessing speech requires attention both to what happened and to how the speaker has acted towards those who depend on the account. Reliability does not require knowing everything; it does require acknowledging the limits of one’s knowledge.
An oath or promise places fidelity behind an undertaking. Its force depends upon a relationship in which others may act in reliance on the words given. Careful speech therefore includes knowing what one is promising, whether it lies within one’s power, and who will bear the consequences if it is left undone. A history of keeping faith gives others grounds for trust, though even a trusted speaker’s factual claims remain open to examination.
Communal memory needs the same care. Witnesses, records, objects, and the consequences of events can help establish what occurred. Each may also be incomplete or misleading. Repetition does not make a story true, and the standing of a powerful speaker cannot replace evidence. When an account is corrected, the correction should reach those whose judgement or conduct the earlier account affected.
For Fyrnsegen, this means cultivating accurate enquiry alongside dependable conduct. People need room to distinguish knowledge from inference, correct an honest mistake, and preserve a confidence without using secrecy to conceal wrongdoing. A sound community asks whether its account is faithful to the evidence and whether its members are keeping faith with the responsibilities they have accepted.
Adapted from Brian Smith · Cynemund, We Are Our Deeds: The Elder Heathenry, Its Ethic and Thew, third edition; chapter three, “Sooth and Truth”.