Indeed, it is perhaps one of the least plausible beliefs ever entertained by profound and influential thinkers.

From The Proper Study of Mankind by Isaiah Berlin.  The essay is From Hope and Fear Set Free.  

I wish to make no judgement of value: only to suggest that to say that knowledge is a good is one thing; to say that it is necessarily, in all situations, compatible with, still more that it is on terms of mutual entailment with (or even, as some seem to suppose, is literally identical with), freedom, in most of the senses in which this word is used, is something very different. Perhaps the second assertion is rooted in the optimistic view – which seems to be at the heart of much metaphysical rationalism – that all good things must be compatible, and that therefore freedom, order, knowledge, happiness, a closed future (and an open one?) must be at least compatible, and perhaps even entail one another in a systematic fashion. But this proposition is not self-evidently true, if only on empirical grounds. Indeed, it is perhaps one of the least plausible beliefs ever entertained by profound and influential thinkers.