But if the facts be such as are known to everyone, for example, the fundamental characteristics of the human mind or the human heart, which are shared by all alike; or the great physical agencies which are constantly in operation before our eyes, or the general course of natural laws; the kind of fame which is to be won by spreading the light of a new and manifestly true theory in regard to them, is such as in time will extend almost all over the civilized world: for if the facts be such as everyone can grasp, the theory also will be generally intelligible. But the extent of the fame will depend upon the difficulties overcome; and the more generally known the facts are, the harder it will be to form a theory that shall be both new and true: because a great many heads will have been occupied with them, and there will be little or no possibility of saying anything that has not been said before. On the other hand, facts which are not accessible to everybody, and can be got at only after much difficulty and labor, nearly always admit of new combinations and theories; so that, if sound understanding and judgment are brought to bear upon them--qualities which do not involve very high intellectual power--a man may easily be so fortunate as to light upon some new theory in regard to them which shall be also true. But fame won on such paths does not extend much beyond those who possess a knowledge of the facts in question. To solve problems of this sort requires, no doubt, a great ideal of study and labor, if only to get at the facts; whilst on the path where the greatest and most widespread fame is to be won, the facts may be grasped without any labor at all. But just in proportion as less labor is necessary, more talent or genius is required; and between such qualities and the drudgery of research no comparison is possible, in respect either of their intrinsic value, or of the estimation in which they are held. And so people who feel that they possess solid intellectual capacity and a sound judgment, and yet cannot claim the highest mental powers, should not be afraid of laborious study; for by its aid they may work themselves above the great mob of humanity who have the facts constantly before their eyes, and reach those secluded spots which are accessible to learned toil.