It is the same with optimism and pessimism. There are people who obstinately hold on to optimism, and there are others who think it is wise to be always pessimistic. Both of these make a mistake. Optimism has its place and so has pessimism. If one looks at every sign of misfortune with pessimism, maybe one will be able to avert a coming misfortune. If for instance a young violinist, among whose audience there are perhaps fifty people who he himself feels do not appreciate him, is pessimistic in regard to that feeling, in time he will find that everyone in the audience will appreciate him. But if this pessimism develops too much he will find in the end that everyone in the audience is against him.