Full Idea
We are forbidden to worship God in the form of an image, for otherwise we might think that we were conceiving of him who is incapable of being conceived. It seems, then, that there is no idea of God in us.
Gist of Idea
We mustn't worship God as an image because we have no idea of him
Source
comment on René Descartes (Meditations [1641], §5.65) by Thomas Hobbes - Objections to 'Meditations' (Third) 180
Book Reference
Descartes,René: 'Meditations on First Philosophy etc.', ed/tr. Cottingham,John [CUP 1986], p.80