On the prejudices of philosophers old psychologists might have found things easier and more enjoyable –: but, in the end, the new psychologist knows by this very token that he is condemned to invention – and, who knows? perhaps to discovery. – Physiologists should think twice before positioning the drive for self- preservation as the cardinal drive of an organic being. Above all, a living thing wants to discharge its strength – life itself is will to power –: self- preservation is only one of the indirect and most frequent consequences of this. – In short, here as elsewhere, watch out for superfluous teleological principles! – such as the drive for preservation (which we owe to Spinoza’s inconsistency –). This is demanded by method, which must essentially be the economy of principles.