There is nothing physical to be learned a priori. We have no right whatever to ascertain a single physical truth without seeking for it physically, unless it be a necessary consequence of other truths already acquired by experiment, in which case mathematical reasoning is alone requisite.


Lectures on Some Recent Advances in Physical Science, With a Special, Lecture on Force, (3rd edition), Lecture I (p. 6)


There is nothing physical to be learned a priori. We have no right whatever to ascertain a single physical truth without seeking for it physically,...

There is nothing physical to be learned a priori. We have no right whatever to ascertain a single physical truth without seeking for it physically,...

There is nothing physical to be learned a priori. We have no right whatever to ascertain a single physical truth without seeking for it physically,...

There is nothing physical to be learned a priori. We have no right whatever to ascertain a single physical truth without seeking for it physically,...