John Stuart Mill Ideas Quotations

A man of clear ideas errs grievously if he imagines that whatever is seen confusedly does not exist; it belongs to him, when he meets with such a thing, to dispel the midst, and fix the outlines of the vague form which is looming through it.

It often happens that the universal belief of one age, a belief from which no one was free or could be free without an extraordinary effort of genius or courage, becomes to a subsequent age, so palpable an absurdity, that the only difficulty is to imagine how such an idea could ever have appeared credible.

God is a word to express, not our ideas, but the want of them.

What little recognition the idea of obligation to the public obtains in modern morality is derived from Greek and Roman sources, not from Christian; as, even in the morality of private life, whatever exists of magnanimity, high-mindeness, personal dignity, even the sense of honor, is derived from the purely human, not the religious part of our education, and never could have grown out of a standard of ethics in which the only worth, professedly recognized, is that of obedience.

I know tolerably well what Ireland was, but have a very imperfect idea of what Ireland is.

Truth emerges from the clash of adverse ideas.

When one's ideas are not challenged, one's ability to defend them weakens.

The English, of all ranks and classes, are at bottom, in all their feelings, aristocrats. They have some concept of liberty, and set some value on it, but the very idea of equality is strange and offensive to them. They do not dislike to have many people above them as long as they have some below them.

The idea is essentially repulsive, of a society held together only by the relations and feelings arising out of pecuniary interest.

This is what writers mean when they say that the notion of cause involves the idea of necessity. If there be any meaning which confessedly belongs to the term necessity, it is unconditionalness. That which is necessary, that which must be, means that which will be, whatever supposition we may make in regard to all other things.

... All ideas need to be heard, because each idea contains one aspect of the truth. By examining that aspect, we add to our own idea of the truth. Even ideas that have no truth in them whatsoever are useful because by disproving them, we add support to our own ideas.

The idea that truth always triumphs over persecution is one of those pleasant falsehoods, which most experience refutes. History is teeming with instances of truth put down by persecution. If not put down forever, it may be set back for centuries.

Protection, therefore, against the tyranny of the magistrate is not enough; there needs protection against the tyranny of the prevailing opinion and feeling, against the tendency of society to impose, by other means than civil penalties, its own ideas and practices as rules of conduct on those who dissent from them.