Full Idea
In creating me, God has endowed me with the idea of God, so that it would be like the mark of the craftsman impressed upon his work, although this mark need not be something distinct from the work itself.
Gist of Idea
The idea of God in my mind is like the mark a craftsman puts on his work
Source
René Descartes (Meditations [1641], §3.51)
Book Reference
Descartes,René: 'Discourse on Method/The Meditations', ed/tr. Sutcliffe,F.E. [Penguin 1968], p.130