A House full of 'sefarim' needs a mezuzah. Even if you have the 'sefiros', from the language of 'sefer', representing Torah study and introspective effort, you still need the action, represented by the mezuzah, leading you to the outside world. 

While the door itself represents Malchus, the lowest level of the higher, the mezuzah represents keser malchus, the crown of the levels below. The pinnacle of our interactions with the world are crowned by divine action.

From the second vayikach Korach Ohr Hatorah 

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