Liberty, then, about which so many volumes have been written is, when accurately defined, only the power of acting. (Voltaire)
Based on the list, it seems that the Rabbi Shneur Zalman's entire collection consisted of a mere few hundred books (this tiny collection of volumes was huge for the Russia of then, yet it was too small for the title of "library").
a contemporary bibliophile and rare-books collector whose personal treasure chest consisted of around 5,000 priceless, aged and rare volumes.