A scientist can hardly encounter anything more desirable than, just as a work is completed, to have its foundation give way. - Gottlob Frege

Every good mathematician is at least half a philosopher, and every good philosopher is at least half a mathematician. - Gottlob Frege

I compare arithmetic with a tree that unfolds upwards in a multitude of techniques and theorems while the root drives into the depths. - Gottlob Frege

The aim of scientific work is truth. While we internally recognise something as true, we judge, and while we utter judgements, we assert. - Gottlob Frege

What is a fact? A fact is a thought that is true. But the scientist will surely not recognize something which depends on men's varying states of mind to be the firm foundation of science. - Gottlob Frege