Nikolaus von Autrecourt über das erste Prinzip und die Gewißheit von Sätzen
Nicholas of Autrecourt maintains in his second letter to Bernard of Arezzo that with the exception of the certitude of faith, there is no other certitude but the certitude of the law of non-contradiction, or the one that can be resolved to this law. The article examines this statement, which implies that natural theology is not possible. It comes to the conclusion that, in general, Nicholas in his letter seems to identify the relation "…can be resolved…" between two certain sentences with the relation "…follows from…". This identification leads to problems which are discussed. Further, Nicholas says that in every valid inference the consequent is identical with the antecedent or is part of it. This can be understood in two ways.