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Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons, possessed of an inventive turn of mind and of considerable skill in the manual operations of practical mechanics, are destitute of that knowledge of scientific principles which is requisite to prevent their being misled by their own ingenuity. Such men too often spend their money, waste their lives, and it may be lose their reason in the vain pursuits of visionary inventions, of which a moderate amount of theoretical knowledge would be sufficient to demonstrate the fallacy ; and for want of such knowledge, many a man who might have been a useful and happy member of society, becomes a being than whom it would be hard to find anything more miserable. The number of those unhappy persons — to judge from the patent-lists, and from some of the mechanical journals — must be much greater than is generally believed.
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"On the harmony of theory and practice in mechanics" in The Mechanics' Magazine (1856), p. 176

 

William John Macquorn Rankine

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This society in which knowledge workers dominate is in danger of a new "class conflict" between the large minority of knowledge workers and the majority of workers who will make their livings through traditional ways, either by manual work... or by service work. The productivity of knowledge work - still abysmally low - will predictably become the economic challenge of the knowledge society. On it will depend the ability of the knowledge society to give decent incomes, and with them dignity and status, to non knowledge people.

 

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We know truth, not only by the reason, but also by the heart, and it is in this last way that we know first principles; and reason, which has no part in it, tries in vain to impugn them. The sceptics, who have only this for their object, labour to no purpose. We know that we do not dream, and however impossible it is for us to prove it by reason, this inability demonstrates only the weakness of our reason, but not, as they affirm, the uncertainty of all our knowledge. For the knowledge of first principles, as space, time, motion, number, is as sure as any of those which we get from reasoning. And reason must trust these intuitions of the heart, and must base them on every argument. (We have intuitive knowledge of the tri-dimensional nature of space, and of the infinity of number, and reason then shows that there are no two square numbers one of which is double of the other. Principles are intuited, propositions are inferred, all with certainty, though in different ways.) And it is as useless and absurd for reason to demand from the heart proofs of her first principles, before admitting them, as it would be for the heart to demand from reason an intuition of all demonstrated propositions before accepting them.
This inability ought, then, to serve only to humble reason, which would judge all, but not to impugn our certainty, as if only reason were capable of instructing us. Would to God, on the contrary, that we had never need of it, and that we knew everything by instinct and intuition! But nature has refused us this boon. On the contrary, she has given us but very little knowledge of this kind; and all the rest can be acquired only by reasoning.
Therefore, those to whom God has imparted religion by intuition are very fortunate, and justly convinced. But to those who do not have it, we can give it only by reasoning, waiting for God to give them spiritual insight, without which faith is only human, and useless for salvation.

 

Blaise Pascal

 

Knowledge is necessary to act in the sense of my going home from here to the place I live; I must have knowledge for this; I must have knowledge to speak English; I must have knowledge to write a letter and so on. Knowledge as function, mechanical function, is necessary. Now if I use that knowledge in my relationship with you, another human being, I am bringing about a barrier, a division between you and me, namely the observer. That is, knowledge, in relationship, in human relationship, is destructive. That is knowledge which is the tradition, the memory, the image, which the mind has built about you, that knowledge is separative and therefore creates conflict in our relationship.

 

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The subject of philosophy is very ancient. The word means: "The love, study or pursuit of wisdom, or of knowledge of things and their causes, whether theoretical or practical."
All we know of science or of religion comes from philosophy. It lies behind and above all other knowledge we have or use.

 

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The only knowledge that can truly orient action is knowledge that frees itself from mere human interests and is based in Ideas—in other words knowledge that has taken a theoretical attitude.

 

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