Full Idea
A completed theoretic philosophy can never be anything more than a completed classification of the world's ingredients.
Gist of Idea
A complete system is just a classification of the whole world's ingredients
Source
William James (The Sentiment of Rationality [1882], p.23)
A Reaction
I assume this is not just the physical ingredients, but must also include our conceptual scheme - but then we must first decide which is the best conceptual scheme to classify, and that's where the real action is. [He scorns such classifation later].
Book Reference
James,William: 'Selected Writings of William James', ed/tr. Bird,Graham [Everyman 1995], p.23