Who said "Death is simply another door."?

This quote is attributed to Agent Brown.

Death is simply another door. - Agent Brown

"Death is simply another door."

Agent Brown Death

"The Matrix has you."

"There is no escaping what you are."

"You carry the seeds of your own destruction."

"Choice is an illusion created between those with power and those without."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."