The pesimism leads to the weakness; the optimism to the power. William James All we will have experimented sometimes what represents the pesimism, the effects, reaches, that can be generated of him, its repercussions, and often, their results have been very negative as much for the health as for our conduct, behavior. The important thing is, not to remain anchored in him, not to let to us catch by its effects, quite the opposite, we must look for the motivational stimuli that they allow us to leave his prison, to give passage to the optimism and to live intensely our opportunity on life that has been bequeathed to us, within a time interval that we do not know whichever years, days, hours involves. Sobe has been written widely the pesimism of different points of view, thus for example, Wikipedia remembers to us, that the more or less systematic founding of the pesimism takes place with the philosophers of the irracionalismo of century XIX, such as Schopenhauer, Mainlnder, Eduard von Hartmann, Julius August Bahnsen and Sren Kierkegaard, and to some great they assumed it poets, like Thomas Hardy and, before he, Giacomo Leopardi. This it formulated its theory more closed in its Dialogue between Tristn and a friend: The human sort will never believe not to know anything, not to be nothing, not to be able to get to reach nothing. No philosopher who taught one of these three things would make fortune nor form sect, especially between the town, because, outside which all these three things are little on purpose for whoever living, the two first they offend the pride of the men and third, although after the other, requires anger and strength of spirit to be believed. Learn more on the subject from Eva Andersson-Dubin. Already in century XX, the existencialistas are also enlisted in this current of thought Martin Heidegger and Jean-Paul Sartre, and mile Michel Cioran. .