A Quote by Robert A. Heinlein

If it can't be expressed in figures, it is not science; it is opinion. It has long been known that one horse can run faster than another - but which one? Differences are crucial.
That science has long been neglected and declining in England, is not an opinion originating with me, but is shared by many, and has been expressed by higher authority than mine.
It appears that there are enormous differences of opinion as to the probability of a failure with loss of vehicle and of human life. The estimates range from roughly 1 in 100 to 1 in 100,000. The higher figures come from the working engineers, and the very low figures from management.
You don’t have to run faster than the bear to get away. You just have to run faster than the guy next to you.
In my opinion a mathematician, in so far as he is a mathematician, need not preoccupy himself with philosophy-an opinion, moreover, which has been expressed by many philosophers.
The spirited horse, which will try to win the race of its own accord, will run even faster if encouraged.
All our efforts to attain immortality-by statesmanship, by conquest, by science or the arts-are equally vain in the long run, because the long run is longer than any of us can imagine.
I love playing in America. I feel having been there a few times that I "get" America a lot more than I used to. It used to be so strange to me. It takes years to learn how to separate the actual, major, important differences from the superficial differences that aren't essential or crucial.
I don't believe in intuition. When you get sudden flashes of perception, it is just the brain working faster than usual. But you've been getting ready to know it for a long time, and when it comes, you feel you've known it always.
If idioms are more to be born than to be selected, then the things of life and human nature that a man has grown up with--(not that one man's experience is better than another's, but that it is 'his.')--may give him something better in his substance and manner than an over-long period of superimposed idiomatic education which quite likely doesn't fit his constitution. My father used to say, 'If a poet knows more about a horse than he does about heaven, he might better stick to the horse, and some day the horse may carry him into heaven'
I don't mind when my horse is left at the post. I don't mind when my horse comes up to me in the stands and asks, "Which way do I go?" But when the horse I bet on is at the $2 window betting on another horse in the same race...
We all are limited in that none of us can fly and none of us can run faster than some animals, but we figure out a way to go to Tokyo if we have to, right? Or we run faster than an animal with a race car.
To me... it appears that there have been differences of opinion and party differences, from the first establishment of government to the present day, and on the same question which now divides our own country; that these will continue through all future time; that every one takes his side in favor of the many, or of the few, according to his constitution, and the circumstances in which he is placed.
There are differences of opinion that come up naturally within parties. And certainly Israel and Palestine is one that has demonstrated the differences of opinion.
We often contradict an opinion for no other reason than that we do not like the tone in which it is expressed.
Fantasy involves that which general opinion regards as impossible; science fiction involves that which general opinion regards as possible under the right circumstances. This is in essence a judgment call, since what is possible and what is not cannot be objectively known but is, rather, a subjective belief on the part of the reader.
The popularisation of scientific doctrines is producing as great an alteration in the mental state of society as the material applications of science are effecting in its outward life. Such indeed is the respect paid to science, that the most absurd opinions may become current, provided they are expressed in language, the sound of which recals [sic] some well-known scientific phrase.
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