The principle of good faith originates from contract of utmost good faith and actio bona fidei under roman law . in an actio bona fidei , the judge may interfere the content of the contract according to the principle of justice and fairness and the sprit of good faith of the parties in the legal relationship 誠實(shí)信用原則簡稱誠信原則,起源于羅馬法的誠信契約和誠信訴訟,誠信訴訟中承審員可以根據(jù)當(dāng)事人在法律關(guān)系中誠信的精神,按公平正義的原則對契約內(nèi)容進(jìn)行干預(yù)。