Hogwarts: An Incomplete and Unreliable Guide (Pottermore Presents, #3)

by J.K. Rowling

The advice to ‘hold on to your dreams’ is all well and good, but there comes a point when holding on to your dreams becomes unhelpful and even unhealthy. Dumbledore knows that life can pass you by while you are clinging on to a wish that can never be – or ought never to be – fulfilled.

I love this. Dumbledore has lots of wise words to offer.