"Many people think that philosophy is inseparable of speculation. They believe that philosopher cannot use methods that establish knowledge, knowledge of facts or of logical relations, and that he should speak a language not verifiable; in short that philosophy is not a science. I try to establish the opposite thesis. I hold that philosophical speculation is a temporary phase. To say it briefly: I have the intention to demonstrate that philosophy started with speculation to arrive to science".
"The scientific philosophy tries to come to conclusions as precise and as sure as the results of science. It insists that the problem of truth must appear inside philosophy in the same sense than in sciences. It does not try to possess an absolute truth, which existence it denies for empirical knowledge. New philosophy is in itself empirical and is satisfied with the empirical truth".
Hans Reichenbach, Rise of the Scientific Philosophy