That which is provable, ought not to be believed in science without proof.


Was sind und was sollen die Zahlen? (1888), Preface, trans. Ivor Grattan-Guinness


That which is provable, ought not to be believed in science without proof.

That which is provable, ought not to be believed in science without proof.

That which is provable, ought not to be believed in science without proof.

That which is provable, ought not to be believed in science without proof.