The Gemara mentions the opinion of R' Papi in the name of Rava that a Beth Din may not write an authorization of witnesses' signatures until after the testimony of the witnesses occured. The Gemara explains "michzi k'shikra" it looks like a falsehood. The sensitivity we can learn from this opinion is immense. Even though the witnesses are standing there ready to testify that it indeed it is their signature and its only for a matter of minutes, since the Beth Din is not absolutely sure that it is true they cannot write the authorization.
How often do we assert something is one hundred percent true, even without two percent of the facts?!