For what reason then do the realists show themselves so unfriendly toward philosophy? Because they misunderstand their own calling and with all their might want to remain restricted instead of becoming unrestricted! Why do they hate abstractions? Because they themselves are abstract since they abstract from the perfection of themselves, from the elevation of redeeming truth!
Max StirnerWhere the world comes in my way - and it comes in my way everywhere - I consume it to quiet the hunger of my egoism. For me you are nothing but - my food, even as I too am fed upon and turned to use by you. We have only one relation to each other, that of usableness, of utility, of use.
Max Stirner