It is the nature of slavery ...

It is the nature of slavery to render its victims so abject that at last, fearing to be free, they multiply their own chains. You can liberate a freeman, but you cannot liberate a slave.
 Louis J. Halle

Quotes from the same author

If what is best in mankind, and what its progress depends on, manifests itself primarily in the individual and only secondarily in the mass, then our objectives should be to maintain such freedom as allows the individual to think and speak for himself.
 Louis J. Halle
The revolt against freedom, which can be traced back so far, is associated with a revolt against reason that [gives] sentiment primacy to evaluate actions and experiences according to the subjective emotions with which they are associated.
 Louis J. Halle