Numbing the pain for a while will make it worse when you finally feel it.
Harry Potter and the Goblet of Fire

Happiness can be found, even in the darkest of times, if one only remembers to turn on the light.
Harry Potter and the Prisoner of Azkaban

The mind is not a book, to be opened at will and examined at leisure. Thoughts are not etched on the inside of skulls, to be perused by an invader. The mind is a complex and many-layered thing.
Harry Potter and the Order of the Phoenix

People find it far easier to forgive others for being wrong than being right.
Harry Potter and the Half-Blood Prince