Bodily and mental peace result from the enjoyment of simple pleasures in moderation. Lacking what we naturally need causes pain. Having or seeking what we do not really need or more than we really need also causes pain. This fear is unreasonable. It is impious to believe that the gods would lower themselves and diminish their happiness with involvement in human affairs.
Life is sensation and feeling.
Since we stop feeling when we die, death is nothing except the release of soul atoms from the body. Death is the end of sensation, the absence of life. It is not painful and not to be feared. It may even be welcomed as the end of bodily pain. Both come to an end with death.