It does not do to dwell on dreams and forget to live.

It does not do to dwell on dreams and forget to live, remember that. -Albus Dumbledore to Harry Potter-

For in dreams we enter a world that is entirely our own. Let them swim in the deepest ocean or glide over the highest cloud. (Albus Dumbledore)

It does not do to dwell on dreams and forget to live.

I had a dream about a motorcycle," said Harry, remembering suddenly. "It was flying."
Uncle Vernon nearly crashed into the car in front. He turned right around in his seat and yelled at Harry, his face like a gigantic beet with a mustache: "MOTORCYCLES DON'T FLY!"
Dudley and Piers sniggered.
"I know they don't," said Harry. "It was only a dream.

Albus Severus," Harry said quietly, so that nobody but Ginny could hear, and she was tactful enough to pretend to be waving to Rose, who was now on the train, "you were named for two headmasters of Hogwarts. One of them was a Slytherin and he was probably the bravest man I ever knew.