You should fear God so that you don't sleep without being conscious of your sins and ask for forgiveness and repentence every prayer.
If you are a family man, you would be a fool to live without care, as your calling is to provide and be on this earth for those who need you. If you are single and called by God to serve in a dangerous manner, then live without any worry because God has put you there and your life may end, but your purpose is to die for the sake that others may come to the faith.