I think they ought to know. ...

I think they ought to know. You do them a disservice by not confiding something this important to them. I didn’t want — — to worry or frighten them? said Dumbledore, surveying Harry over the top of his half-moon spectacles. Or perhaps, to confess that you yourself are worried and frightened? You need your friends, Harry. As you so rightly said, Sirius would not have wanted you to shut yourself away.
I think they ought to know. You do them a disservice by not confiding something this important to them. I didn’t want — — to worry or frighten them? said Dumbledore, surveying Harry over the top of his half-moon spectacles. Or perhaps, to confess that you yourself are worried and frightened? You need your friends, Harry. As you so rightly said, Sirius would not have wanted you to shut yourself away.

Quotes from the same author

Raindrops the size of bullets thundered on the castle windows for days on end; the lake rose, the flower beds turned into muddy streams, and Hagrid’s pumpkins swelled to the size of garden sheds.
He didn't realize that love as powerful as your mother's for you leaves its own mark.
I am prouder of my years as a single mother than of any other part of my life.
So why in the name of Merlin’s saggy left — Don’t talk to your mother like that.
Hermione drew herself to her full height; her eyes were narrowed and her hair seemed to crackle with electricity. "No," she said, her voice quivering with anger, "but I will write to your mother.