The mind, or genius, has been compared to a spark of fire, which is smothered by a heap of fuel, and prevented from blazing into a flame. This simile, which is made use of by the younger Pliny, may be easily mistaken for argument or proof. But there is no danger of the mind being overburthened with knowledge, or the genius extinguished by any addition of images; on the contrary, these acquisitions may as well, perhaps better, be compared, if comparisons signified anything in reasoning, to the supply of living embers, which will contribute to strengthen the spark, that without the association of more fuel would have died away. The truth is, he whose feebleness is such, as to make other men's thoughts an incumbrance to him, can have no very great strength of mind or genius of his own to be destroyed; so that not much harm will be done at worst. We may oppose to Pliny the greater authority of Cicero, who is continually enforcing the necessity of this method of study. In his dialogue on Oratory, he makes Crassus say, that one of the first and most important precepts is, to choose a proper model for our imitation. _Hoc sit primum in proeceptis meis, ut demonstremus quem imitemur._ When I speak of the habitual imitation and continued study of masters, it is not to be understood that I advise any endeavour to copy the exact peculiar colour and complexion of another man's mind; the success of such an attempt must always be like his, who imitates exactly the air, manner, and gestures of him whom he admires. His model may be excellent, but the copy will be ridiculous; this ridicule does not arise from his having imitated, but from his not having chosen the right mode of imitation. It is a necessary and warrantable pride to disdain to walk servilely behind any individual, however elevated his rank. The true and liberal ground of imitation is an open field; where, though he who precedes has had the advantage of starting before you, you may always propose to overtake him; it is enough, however, to pursue his course; you need not tread in his footsteps, and you certainly have a right to outstrip him if you can. Nor whilst I recommend studying the art from artists, can I be supposed to mean that nature is to be neglected; I take this study in aid, and not in exclusion of the other. Nature is and must be the fountain which alone is inexhaustible, and from which all excellencies must originally flow.