No doubt sometimes pessimism shows conscientiousness and cleverness, and it may also show experience. But conscientiousness alone will never be enough to overcome the difficulties one meets in one's life; it is trust that solves its problems. The wise have understood that cleverness does not reach far; it goes a certain distance and then no further, for cleverness is knowledge which belongs to the earth. And as to experience, what is man's experience? One is only proud of one's experience until one has seen how vast the world is. In every line of work and thought there is no moment when experience is not needed, but the further man goes in experience the more he sees how little he knows.