The ideas which are here expressed so laboriously are extremely simple and should be obvious. The difficulty lies, not in the new ideas, but in escaping from the old ones, which ramify, for those brought up as most of us have been, into every corner of our minds.

Modern formulations are necessary even in defense of very ancient truths. Not because of any alleged anachronism in the old ideas – the Beatitudes remain the essential statements of the Western code – but because the idiom of life is always changing

Some men's words I remember so well that I must often use them to express my thought. Yes, because I perceive that we have heard the same truth, but they have heard it better.

There are truths which are not for all men, nor for all times.

The majority of men prefer delusion to truth. It soothes. It is easy to grasp. Above all, it fits more snugly than the truth into a universe of false appearances — of complex and irrational phenomena, defectively grasped. But though an idea that is true is thus not likely to prevail, an idea that is attacked enjoys a great advantage. The evidence behind it is now supported by sympathy, the sporting instinct, sentimentality — and sentimentality is as powerful as an army with banners. One never hears of a martyr in history whose notions are seriously disputed today. The forgotten ideas are those of the men who put them forward soberly and quietly, hoping fatuously that they would conquer by the force of their truth; these are the ideas that we now struggle to rediscover.

Ideas must work through the brains and arms of men, or they are no better than dreams

Beware clarity. A man speaking to you in clear language is clearly using obsolete ideas.

True opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.

We shouldn’t preserve our first opinions as if they reflect our pure, untarnished, true nature. They’re often just the result of inexperience or a temporary phase. Old opinions shouldn’t define who we are in the future.

But there are certain meanings that are lost forever the moment they are explained in words.

I know that most men, including those at ease with problems of the greatest complexity, can seldom accept even the simplest and most obvious truth if it be such as would oblige them to admit the falsity of conclusions which they have delighted in explaining to colleagues, which they have proudly taught to others, and which they have woven, thread by thread, into the fabric of their lives.

The most violent revolutions in an individual's beliefs leave most of his old order standing. Time and space, cause and effect, nature and history, and one's own biography remain untouched. New truth is always a go-between, a smoother-over of transitions. It marries old opinion to new fact so as ever to show a minimum of jolt, a maximum of continuity.

The difficulty lies, not in the new ideas, but in escaping from the old ones, which ramify, for those brought up as most of us have been, into every corner of our minds.

These things he told to his grandsons carefully, slowly and at length, because they were old and true, and they could be lost forever as easily as one generation is lost to the next, as easily as one old man might lose his voice, having spoken not enough or not at all.