The rule is derived inductively from experience, therefore does not have any inner necessity, is always valid only for special cases and can anytime be refuted by opposite facts. On the contrary, the law is a logical relation between conceptual constructions; it is therefore deductible from upper [übergeordnete] laws and enables the derivation of lower laws; it has as such a logical necessity in concordance with its upper premises; it is not a mere statement of probability, but has a compelling, apodictic logical value once its premises are accepted

p. 91; as cited in: M. Drack, W. Apfalter, D. Pouvreau (2007) "On the making of a system theory of life: Paul A Weiss and Ludwig von Bertalanffy's conceptual connection". in: Q Rev Biol. 2007 December; 82(4): 349–373. - Kritische Theorie der Formbildung (1928, 1933)

On The Making Of A System Theory Of Life: Paul A Weiss And Ludwig Von Bertalanffy's Conceptual Connection[ncbi.nlm.nih.gov]