Full Idea
We can have knowledge of what is outside us only through the mediation of ideas in us.
Gist of Idea
We can only know the exterior world via our ideas
Source
Arnauld / Nicole (Logic (Port-Royal Art of Thinking) [1662], p.63), quoted by J. Alberto Coffa - The Semantic Tradition from Kant to Carnap 1 'Conc'
Book Reference
Coffa,J.Alberto: 'The Semantic Tradition from Kant to Carnap' [CUP 1993], p.9