"A younger sister is someone to use as a guinea-pig in trying sledges and experimental go-carts. Someone to send on messages to Mum. But someone who needs you - who comes to you with bumped heads, grazed knees, tales of persecution. Someone who trusts you to defend her. Someone who thinks you know the answers to almost everything."

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Let us suppose the mind to be, as we say, white paper, void of all characters, without any ideas; how comes it to be furnished? Whence comes it by that vast store which the busy and boundless fancy of man has painted on it with an almost endless variety? Whence has it all the materials of reason and knowledge? To this I answer, in one word, from experience.

— John Locke