All intellectual superiority is the fruit of active effort.
 John Stuart Mill, Considerations on Representative Government (1861). copy citation

Context

“and, moreover, that it is much easier for an active mind to acquire the virtues of patience, than for a passive one to assume those of energy. Of the three varieties of mental excellence, intellectual, practical, and moral, there never could be any doubt in regard to the first two, which side had the advantage. All intellectual superiority is the fruit of active effort. Enterprise, the desire to keep moving, to be trying and accomplishing new things for our own benefit or that of others, is the parent even of speculative, and much more of practical, talent. The intellectual culture compatible with the other type is of that feeble and vague description which belongs to a mind that stops at amusement or at simple contemplation.” source