Pessimism leads to weakness; the optimism to power. William James all will have ever experienced what represents pessimism, the purpose, scope, which can be generated, its impact, and many times, its results have been very negative both for health and for our behavior, behavior. The important thing is not to stay anchored in it, do not let us catch for their effects, otherwise, we must look for motivational incentives that allow us to get out of his prison, giving way to optimism and live intensely our chance at life that is has bequeathed us, within a time frame which we do not know how much years, days, hours involved. Has written widely so sobe pessimism from different points of view, for example, Wikipedia reminds us, that the Foundation more or less systematic pessimism takes place with the philosophers of the irrationalism of the 19th century, such as Schopenhauer, Mainlander, Eduard von Hartmann, Julius August Bahnsen and Soren Kierkegaard, and took it some great poets, as Thomas Hardy and, before him, Giacomo Leopardi. This formulated his theory more closed in its dialogue between Tristan and a friend: mankind will not believe never know nothing, nothing, not be not be able to reach anything. No philosopher who teach one of these three things would make fortune nor formed sect, especially among the people, because, is that all these three things are little purpose for anyone who wants to live, the first two offend the pride of the men and the third, but after the others, requires courage and fortitude to be believed. In the 20th century, engage is also in this current of thought existentialists Martin Heidegger and Jean-Paul Sartre, and emile Michel Cioran. It is possible to also refer to certain pessimistic background inherent in religions (especially Buddhism), although all tend, to a greater or lesser extent, to ensure some kind of redemption.