41.
Man discourseth greatly, and his discourse is for the greater part empty and false; the discourse of animals is small, but useful and true: slender certainty is better than portentous falsehood.
42.
What is an element? It is not in man's power to define the quiddity of the elements, but a great many of their effects are known.
43.
That which is divisible in fact is divisible in potentiality also; but not all quantities which are divisible in potentiality are divisible in fact.
Infinity incomprehensible
44.
What is that thing which is not defined and would not exist if it were defined? It is infinity, which if it could be defined would be limited and finite, because that which can be defined ends with the limits of its circumference, and that which cannot be defined has no limits.
45.