There is a continuum which starts with direct sensory observations and proceeds to enormously complex, indirect methods of observation.

In science there are no 'depths'; there is surface everywhere.

To work in this spirit would be my task from now on!

If one is interested in the relations between fields which, according to customary academic divisions, belong to different departments, then he will not be welcomed as a builder of bridges, as he might have expected, but will rather be regarded by both sides as an outsider and troublesome intruder.

Logic is the last scientific ingredient of Philosophy; its extraction leaves behind only a confusion of non-scientific, pseudo problems.

Observation and thinking are the two points of departure for all the spiritual striving of man, insofar as he is conscious of such striving. The workings of common sense, as well as the most complicated scientific researches, rest on these two fundamental pillars of our spirit.