A school may be regarded as a single individual who talks to himself for a hundred years, and takes an extraordinary pleasure in his own being, however foolish and silly it may be. 570 In science it is a service of the highest merit to seek out those fragmentary truths attained by the ancients, and to develop them further. 571 If a man devotes himself to the promotion of science, he is firstly opposed, and then he is informed that his ground is already occupied. At first men will allow no value to what we tell them, and then they behave as if they knew it all themselves. 572 Nature fills all space with her limitless productivity. If we observe merely our own earth, everything that we call evil and unfortunate is so because Nature cannot provide room for everything that comes into existence, and still less endow it with permanence. 573 Everything that comes into being seeks room for itself and desires duration: hence it drives something else from its place and shortens its duration. 574 There is so much of cryptogamy in phanerogamy that centuries will not decipher it. 575 What a true saying it is that he who wants to deceive mankind must before all things make absurdity plausible. 576 The further knowledge advances, the nearer we come to the unfathomable: the more we know how to use our knowledge, the better we see that the unfathomable is of no practical use. 577 The finest achievement for a man of thought is to have fathomed what may be fathomed, and quietly to revere the unfathomable. 578 The discerning man who acknowledges his limitations is not far off perfection. 579 There are two things of which a man cannot be careful enough: of obstinacy if he confines himself to his own line of thought; of incompetency, if he goes beyond it. 580 Incompetency is a greater obstacle to perfection than one would think. 581 The century advances; but every individual begins anew. 582 What friends do with us and for us is a real part of our life; for it strengthens and advances our personality. The assault of our enemies is not part of our life; it is only part of our experience; we throw it off and guard ourselves against it as against frost, storm, rain, hail, or any other of the external evils which may be expected to happen. 583 A man cannot live with every one, and therefore he cannot live for every one. To see this truth aright is to place a high value upon one's friends, and not to hate or persecute one's enemies. Nay, there is hardly any greater advantage for a man to gain than to find out, if he can, the merits of his opponents: it gives him a decided ascendency over them. 584 Every one knows how to value what he has attained in life; most of all the man who thinks and reflects in his old age. He has a comfortable feeling that it is something of which no one can rob him. 585 The best metempsychosis is for us to appear again in others. 586