Student or Learner
A certain lady tells another one what it was like when she lived with her father.
Her father’s house, where she had spent the first eighteen years of her life, had been a sentimental shrine to the mother who had died when she was ten. Even so small a variation as the substitution of one flower vase for another would evoke a comment, all the more forceful for being made in a sad and gentle manner: ‘Your dear mother always used the green bowl for daffodils.’
Does it mean that her father's comment, because it was sad and gentle seemed to be more persuasive?
Not persuasive, but powerfully emotional.