No perfect solution is, not merely in practice, but in principle, possible in human affairs, and any determined attempt to produce it is likely to lead to suffering, disillusionment and failure.
Isaiah BerlinLiberty is liberty, not equality or fairness or justice or human happiness or a quiet conscience.
Isaiah BerlinThe underlying assumption that human nature is basically the same at all times, everywhere, and obeys eternal laws beyond human control, is a conception that only a handful of bold thinkers have dared to question.
Isaiah Berlin