but you walk most easily when you have no stick, and you think with the greatest perfection when you have no pen in your hand. It is only when a man begins to be old that he likes to use a stick and is glad to take up his pen.
When an hypothesis has once come to birth in the mind, or gained a footing there, it leads a life so far comparable with the life of an organism, as that it assimilates matter from the outer world only when it is like in kind with it and beneficial; and when, contrarily, such matter is not like in kind but hurtful, the hypothesis, equally with the organism, throws it off, or, if forced to take it, gets rid of it again entire.
To gain immortality an author must possess so many excellences that while it will not be easy to find anyone to understand and appreciate them all, there will be men in every age who are able to recognize and value some of them. In this way the credit of his book will be maintained throughout the long course of centuries, in spite of the fact that human interests are always changing.
An author like this, who has a claim to the continuance of his life even with posterity, can only be a man who, over the wide earth, will seek his like in vain, and offer a palpable contrast with everyone else in virtue of his unmistakable distinction. Nay, more: were he, like the wandering Jew, to live through several generations, he would still remain in the same superior position. If this were not so, it would be difficult to see why his thoughts should not perish like those of other men.
