Very often pessimistic people speak against their own desire. They want to undertake some work, and they say, 'I will do this, but I don't think I shall succeed in it.' Thus they hinder themselves in their path. Man does not know that every thought makes an impression on the consciousness and on the rhythm with which the consciousness is working. According to that rhythm that reflection will come true and happen; and a man proves to be his own enemy by his ignorance of these things.