Full Idea
Ordinarily, when ideas are thoroughly understood, their agreements and disagreements are apparent.
Gist of Idea
Understanding grasps the agreements and disagreements of ideas
Source
Gottfried Leibniz (New Essays on Human Understanding [1704], 4.02)
Book Reference
Leibniz,Gottfried: 'New Essays on Human Understanding', ed/tr. Remnant/Bennett [CUP 1996], p.375
A Reaction
In other words, there is a holistic aspect of understanding, which makes us ask how understanding ever gets off the ground. Is it not possible to understand a single idea in isolation?