Full Idea
There must always be some basis for the connexion between the terms of a proposition, and it is to be found in their concepts.
Gist of Idea
Concepts are what unite a proposition
Source
Gottfried Leibniz (Letters to Antoine Arnauld [1686], 1686.07.4/14 X)
Book Reference
Leibniz,Gottfried: 'The Leibniz-Arnauld Correspondence', ed/tr. Mason,HT/Parkinson,GHR [Manchester UP 1967], p.63
A Reaction
We face the problem that bothered Russell, of the unity of the proposition. We are also led to the question of HOW our concepts connect the parts of a proposition. Do concepts have valencies? Are they incomplete, as Frege suggests?