Authors:

Also she had the power of silent sympathy. That sounds rather dull, I know, but it's not so dull as it sounds. It just means that a person is able to know that you are unhappy, and to love you extra on that account, without bothering you by telling you all the time how sorry she is for you.

E. Nesbit (2013). “Delphi Complete Novels of E. Nesbit”, p.1388, Delphi Classics
Also she had the power of silent sympathy. That sounds rather dull, I know, but it's not so dull as it sounds. It just means that a person is able to know that you are unhappy, and to love you extra on that account,