Virtue is knowledge, and therefore virtue can be taught.
To the doctrine that virtue is knowledge, Plato has been constantly tending in the previous Dialogues.
Even if there be no true knowledge, as is proved by 'the wretched state of education,' there may be right opinion, which is a sort of guessing or divination resting on no knowledge of causes, and incommunicable to others.
To him knowledge, if only attainable in this world, is of all things the most divine.
The philosopher only has knowledge, and yet the statesman and the poet are inspired.
And Socrates himself appears to be conscious of their weakness; for he adds immediately afterwards, 'I have said some things of which I am not altogether confident.' (Compare Phaedo.) It may be observed, however, that the fanciful notion of pre-existence is combined with a true but partial view of the origin and unity of knowledge, and of the association of ideas.
Meno
Now this conversation in our historian must be universal, that is, with all ranks and degrees of men; for the
knowledge of what is called high life will not instruct him in low; nor, e converso , will his being acquainted with the inferior part of mankind teach him the manners of the superior.
The History of Tom Jones a Foundling
Like Brentano, I am interested in psychology, not so much for its own sake, as for the light that it may throw on the problem of knowledge. Until very lately I believed, as he did, that mental phenomena have essential reference to objects, except possibly in the case of pleasure and pain.
It is held that knowledge of the outer world is constituted by the relation to the object, while the fact that knowledge is different from what it knows is due to the fact that knowledge comes by way of contents.
Modern idealism professes to be by no means confined to the present thought or the present thinker in regard to its knowledge; indeed, it contends that the world is so organic, so dove-tailed, that from any one portion the whole can be inferred, as the complete skeleton of an extinct animal can be inferred from one bone.
The relation itself is a part of pure experience; one of its 'terms' becomes the subject or bearer of the knowledge, the knower, the other becomes the object known"(p.
They deny altogether that there is a separate source of knowledge called "introspection," by which we can know things about ourselves which we could never observe in others.
The Analysis of Mind
He vaguely felt, too, that what he called his new convictions were not merely lack of
knowledge, but that they were part of a whole order of ideas, in which no
knowledge of what he needed was possible.
Anna Karenina
The knowledge relating to them must evidently be of a kind that will either be suggested by the nature of the article itself, or can easily be procured from any well-informed man, especially of the mercantile class.
In either case, the EXECUTION of the business, which alone requires the knowledge of local details, must be devolved upon discreet persons in the character of commissioners or assessors, elected by the people or appointed by the government for the purpose.
Federalist Papers Authored by Alexander Hamilton