Glinda told Dorothy, at the end of her journey trying to get home along the Yellow Brick Road, that she had the power to get home all along. Dorothy didn't know that. She needed to experience what she did along the Yellow Brick Road, face the challenges she did and confront the fears that she did, in order to gain that belief that Glinda told her she had all along.
We are all like Dorothy and life is like the journey along the Yellow Brick Road.
Also read: The Buckingham hosts inaugural blood drive