From *the form of time and of the single dimension* of the series of representations, on account of which the intellect, in order to take up one thing, must drop everything else, there follows not only the intellect’s distraction, but also its *forgetfulness*. Most of what it has dropped it never takes up again, especially as the taking up again is bound to the principle of sufficient reason, and thus requires an occasion which the association of ideas and motivation have first to provide. Yet this occasion may be the remoter and the smaller, the more our susceptibility to it is enhanced by interest in the subject. But, as I have already shown in the essay *On the Principle of Sufficient Reason*, memory is not a receptacle, but a mere faculty, acquired by practice, of bringing forth any representations at random, so that these have always to be kept in practice by repetition, otherwise they are gradually lost. Accordingly, the knowledge even of the scholarly head exists only *virtualiter* as an acquired practice in producing certain representations. *Actualiter*, on the other hand, it is restricted to one particular representation, and for the moment is conscious of this one alone. Hence there results a strange contrast between what a man knows *potentia* and what he knows *actu*, in other words, between his knowledge and his thinking at any moment. The former is an immense and always somewhat chaotic mass, the latter a single, distinct thought. The relation is like that between the innumerable stars of the heavens and the telescope’s narrow field of vision; it stands out remarkably when, on some occasion, a man wishes to bring to distinct recollection some isolated fact from his knowledge, and time and trouble are required to look for it and pick it out of that chaos. Rapidity in doing this is a special gift, but depends very much on the day and the hour; therefore sometimes memory refuses its service, even in things which, at another time, it has ready at hand. This consideration requires us in our studies to strive after the attainment of correct insight rather than an increase of learning, and to take to heart the fact that the *quality* of knowledge is more important than its quantity. Quantity gives books only thickness; quality imparts thoroughness as well as style; for it is an *intensive* dimension, whereas the other is merely extensive. It consists in the distinctness and completeness of the concepts, together with the purity and accuracy of the knowledge of perception that forms their foundation. Therefore the whole of knowledge in all its parts is permeated by it, and is valuable or troubling accordingly. With a small quantity but good quality of knowledge we achieve more than with a very great quantity but bad quality."—from_The World as Will and Representation_. Translated from the German by E. F. J. Payne in two volumes: volume II, pp. 139-141
Thus Epicurus also, when he designs to destroy the natural fellowship of mankind, at the same time makes use of that which he destroys.For what does he say? ‘Be not deceived, men, nor be led astray, nor be mistaken: there is no natural fellowship among rational animals; believe me. But those who say otherwise, deceive you and seduce you by false reasons.’—What is this to you? Permit us to be deceived.Will you fare worse, if all the rest of us are persuaded that there is a natural fellowship among us, and that it ought by all means to be preserved? Nay, it will be much better and safer for you.Man, why do you trouble yourself about us? Why do you keep awake for us? Why do you light your lamp? Why do you rise early? Why do you write so many books, that no one of us may be deceived about the gods and believe that they take care of men; or that no one may suppose the nature of good to be other than pleasure?For if this is so, lie down and sleep, and lead the life of a worm, of which you judged yourself worthy: eat and drink, and enjoy women, and ease yourself, and snore.And what is it to you, how the rest shall think about these things, whether right or wrong? For what have we to do with you?You take care of sheep because they supply us with wool and milk, and last of all with their flesh. Would it not be a desirable thing if men could be lulled and enchanted by the Stoics, and sleep and present themselves to you and to those like you to be shorn and milked?For this you ought to say to your brother Epicureans: but ought you not to conceal it from others, and particularly before every thing to persuade them, that we are by nature adapted for fellowship, that temperance is a good thing; in order that all things may be secured for you?Or ought we to maintain this fellowship with some and not with others? With whom then ought we to maintain it?With such as on their part also maintain it, or with such as violate this fellowship?And who violate it more than you who establish such doctrines?What then was it that waked Epicurus from his sleepiness, and compelled him to write what he did write?