But the fact a person denies that he is theorising is no reason for taking him at his word and failing to investigate what implicit theory is involved in his statements.

But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.

It is that of increasing knowledge of empirical fact, intimately combined with changing interpretations of this body of fact - hence changing general statements about it - and, not least, a changing a structure of the theoretical system.

Special emphasis should be laid on this intimate interrelation of general statements about empirical fact with the logical elements and structure of theoretical systems.

Theory not only formulates what we know but also tells us what we want to know, that is, the questions to which an answer is needed.

If we find the answer [the unified theory], it would be the ultimate triumph of human reason -- for we would know the mind of God."