Different vows have different levels of strength regarding whether or not one can go to a chacham to cancel the vow. The takana of having witnesses sign on the get is explained both according to Rabbi Elazar (who claims that according to the Torah there is no need to witnesses to sign the get) and according to Rabbi Meir (who claims that from the Torah you need witnesses to sign on the get). The takana of pruzbol is questioned – how can the rabbis make a takana to go against what the Torah says. Two explanations are given. Later Rabbis had different reactions to pruzbol about whether or not it was a positive development.