Nothing happens to us unless we permit it to.

If you let unhappiness and resentment, bitterness, jealousy and fear past your personal gate, you simply have to round them up and herd them right back out the doors again. That kind of visitor can rage and howl and perform outside, but simply cannot be allowed inside to track up the floor, behave badly and break the china. Inner peace means occasional intruder-hunts and as good gate-keeping as you can manage.

The corollary to this is: Friendships are the fire in the hearth.