A world where Evil is not as powerful as Good is a world out of balance.
If you lose your concentration, you lose your balance.
They need someone to be Wicked, so that you can be Good.[to Glinda]
Sometimes to lose balance for love is part of living balanced life.
Everything you see exists together in a delicate balance. As king, you need to understand that balance and respect all the creatures, from the crawling ant to the leaping antelope.
Balance is not letting anybody love you less than you love yourself.