Ending Hostility - Sutta Nipata 4.15

The Buddha Gotama said, there is no security or safety from arming one's self, only fear. If arming one's self protected one from attack, or aided in one's defense, there would not be so many people presently fighting each other, having fought each other for so long. Hostility is the cause of fighting, or insecurity, of weapon-taking. Like a painful sting or thorn whose pain causes a person to run about and rave insanely, only when hostility is taken out is there an opportunity to settle down; only when hostility is removed is there an opportunity for peace. To remove hostility, one must no longer grieve, one must no longer mourn. To become beyond grief, beyond mourning, one must become disattached, and let go of the past. All that has gone before. And all that is to come - have no hope for it. Don't even hold onto what lies between "then" and "later." To have nothing, to let go, requires understanding "this is not mine" and "this is not theirs."