Now you jump to conclusions so quickly! At first, he was more careful. You’re right. Many people called it his weakness. But I use the word ‘conclusions’. Actually, this is not a matter of proof. Veteran be strong be brave be humble be badass poster. Descartes just wanted to say that we all have the idea of a perfect entity and that the idea itself contains the fact that that perfect entity must exist. Because a perfect entity wouldn’t be perfect if it didn’t exist. Without a perfect entity we would have no idea of it. Since we are not perfect, the concept of perfection cannot come from us.