Full Idea
Although intrinsic obviousness is the basis of every science, it is never, in a fairly advanced science, the whole of our reason for believing any one proposition of the science.
Gist of Idea
Believing a whole science is more than believing each of its propositions
Source
Bertrand Russell (Regressive Method for Premises in Mathematics [1907], p.279)
Book Reference
Russell,Bertrand: 'Essays in Analysis', ed/tr. Lackey,Douglas [George Braziller 1973], p.279