Descartes considers several ideas as potential instances to offer a way out of the egocentric predicament:

• myself
• God
• coporeal and inanimate things
• angels
• other animals
• other men

The last three Descartes is convinced he could have derived from the first three. (IP3 53a)

The idea of himself he is adequate to produce.

He argues that he, as a substance, could have generated the idea of idea of material substances, especially since they are not clear ideas. (IP3 53b) Here he appeals to the wax example.

This leaves the idea of God to consider.