Confidence:

Li Bai "I am born with talents that will be useful, and I will come back after all the money I have spent"

Inferiority:

Spino Sha

To think too low of oneself because of pain is low self-esteem.

Conceit:

Pride and complacency are a terrible trap for us, and this trap is dug by ourselves.

——Lao She

People cannot be arrogant, but they cannot be arrogant.

——Xu Beihong