“Notorious, too, are the dealings of heretics with swarms of magicians and charlatans and astrologers and philosophers — all, of course, devotees of speculation. You can judge the quality of their faith from the way they behave. Discipline is an index to doctrine.”

Apologia Pro Vita Sua [A defense of one's own life] (1864)

New Preface, p. v
Main Currents Of Marxism (1978)

Not reliably sourced, as this has thus far been found only in a Rastafarian publication http://www.himchurch.org/index.html on the internet which conflates several different statements by Haile Selassie made between 1948 and 1966 with some made by Sarvepalli Radhakrishnan which were merely quoted by Selassie in 1965.
Disputed

Source: The Angel's Game

Source: The Walking Drum (1984), Ch. 31
Context: How much could I tell them? How much dared I tell them? What was the point at which acceptance would begin to yield to doubt? For the mind must be prepared for knowledge as one prepares a field for planting, and a discovery made too soon is no better than a discovery not made at all. Had I been a Christian, I would undoubtedly have been considered a heretic, for what the world has always needed is more heretics and less authority. There can be no order or progress without discipline, but authority can be quite different. Authority, in this world in which I moved, implied belief in and acceptance of a dogma, and dogma is invariably wrong, as knowledge is always in a state of transition. The radical ideas of today are often the conservative policies of tomorrow, and dogma is left protesting by the wayside.  Each generation has a group that wishes to impose a static pattern on events, a static pattern that would hold society forever immobile in a position favorable to the group in question. <!--
Much of the conflict in the minds and arguments of those about me was due to a basic conflict between religious doctrines based primarily upon faith, and Greek philosophy, which was an attempt to interpret experience by reason. Or so it seemed to me, a man with much to learn.

I Ain't Got Time To Bleed (1999)
Context: I don't support abortion. I could never participate in one. But I think it would be a mistake to make them illegal again. What criminalization will do is force women into garages and back alleys, and then you're going to have two lives in jeopardy. My mom, who was a nurse, used to talk about the messes that would come in after back-alley abortions went wrong. The way to stop abortion is to deal, philosophically and spiritually, with the people who get them. And that's not something government can touch.

Journal entry (25 January 1676), quoted in John Lough (ed.), Locke's Travels in France 1675-1679 (Cambridge University Press, 1953), p. 20.