I left out a few more sentences I urgently need you to check.
1) Cowardice is the ability to stay alive and bear the pain of human condition.
2) What does the Latin term quietus mean?
(I don't know how to express this)
3) A quietus was a statement which released an accountant from his responsibility for the accounts he was working on.
4) It is the thought of something after death that makes men patiently endure life's sufferings and prevents them from committing suicide.
I disagree with #1.
In Latin, 'quietus' just means 'quiet.'