Sometimes I wonder why this is not the most famous saying of Epicurus of all, and it's right from his own pen, in his letter to Menoeceus:
"For life has no terrors for him who has thoroughly apprehended that there are no terrors for him in ceasing to live." (Hicks)
"For there is nothing terrible in life for the man who has truly comprehended that there is nothing terrible in not living." (Bailey)
"For there is nothing terrible in living to a man who rightly comprehends that there is nothing terrible in ceasing to live." (Yonge)
"For there is nothing to be feared while living by the man who genuinely grasped the idea that there is nothing to be feared when not living." (DeWitt)