"But genius, and even great talent, springs less from seeds o..." — Marcel Proust quote meaning

But genius, and even great talent, springs less from seeds of intellect and social refinement superior to those of other people than from the faculty of transforming and transposing them. To heat a liquid with an electric lamp requires not the strongest lamp possible, but one of which the current can cease to illuminate, can be diverted so as to give heat instead of light. To mount the skies it is not necessary to have the most powerful of motors, one must have a motor which, instead of continuing to run along the earth's surface, intersecting with a vertical line the horizontal line which it began by following, is capable of converting its speed into lifting power. Similarly, the men who produce works of genius are not those who live in the most delicate atmosphere, whose conversation is the most brilliant or their culture the most extensive, but those who have had the power, ceasing suddenly to live only for themselves, to transform their personality into a sort of mirror, in such a way that their life, however mediocre it may be socially and even, in a sense, intellectually, is reflected by it, genius consisting in reflecting power and not int he intrinsic quality of the scene reflected.