William Shawcross said this quote

After she married the Duke of York, she immediately transformed his life, bringing him love, understanding, sympathy and support for which he had always craved. She inspired him, she calmed him and she enabled him for the first time in his life to believe in himself. Her sense of humor awoke his own, her natural gaiety lightened him. Their marriage was a rare union in which each complemented and enhanced the other.