I find that document unreliable it is as simple as that.
it is misleading due to the translation it uses of words, and its dealing with words as the same which are different this is blatently obvious just with the two quotes from it you and myself provided, inaccurate = unreliable
1 + 1 = 2.5 = wrong
1 + 1 = 2 = correct
what are you trying to prove?
He who knows only his own side of the case knows little of that. His reasons may be good, and no one may have been able to refute them.
But if he is equally unable to refute the reasons on the opposite side, if he does not so much as know what they are, he has no ground for preferring either opinion …
He must be able to hear them from persons who actually believe them … he must know them in their most plausible and persuasive form.