Who said "Death is the only certainty here."?

This quote is attributed to Armstrong.

Death is the only certainty here. - Armstrong

"Death is the only certainty here."

Armstrong Death

Character in And Then There Were None

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"We are none of us infallible."

"The innocent suffer with the guilty."

"Each of us has something to hide."

"We deserve what comes."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."