The Princess and the Goblin (Princess Irene and Curdie, #1)

by George MacDonald

For she had felt all the time that Curdie was not believing what she told him. 'There!—don't you see it shining on before us?' she added. 'I don't see anything,' persisted Curdie. 'Then you must believe without seeing,' said the princess; 'for you can't deny it has brought us out of the mountain.'

'People must believe what they can, and those who believe more must not be hard upon those who believe less.