To jog the understanding is a greater feat than to jog the memory: For it takes more to make a person think than to make one remember. Some fail to strike when the iron is hot because they fail to see the opportunity; so let a bit of friendly advice help them to see their chance. One of the great attributes of the mind is its power to know when opportunity offers. But where such mind is lacking, many things fail to be done which might have been. On which account let the one give light who has it, and let the one seek it who needs to: the former with reserve, the latter seek it who needs to: the former with reserve, the latter with ardor. But let it not be more than mere suggestion. Such reticence is necessary, and in proportion to the stake involved of the one who makes it. Show your interest and go beyond it but not too far: If you receive a no, go in search of a yes. But do so with art, for in most instances nothing is won because nothing was ventured.
~ Baltasar Gracian, The Art of Worldly Wisdom (1647)