Ortega y Gasset asked the philosopher for the courtesy of clarity. The circumstances of the present moment, in continuous transformation, add to the Orteguian requirement another second no less pressing: brevity. Who truly knows something, is able to say it in a luminous way and in brief space, say a thousand words. And this is the spirit that animates Javier Gomá in this collection of essays, or microassay, which is summarized in his title: Todo a mil. The goal is, in a thousand words, to introduce the reader to the almond of philosophical reflection. Thus, for example, some of these micro-assays risk precisely defining normally diffuse questions such as wisdom versus intelligence or human dignity; there are some who advocate countercurrent attitudes, such as the benefits of sitting, the disdain for novelties, the advantages of gossip or the joyful affirmation of our time; others criticize received ideas as settled as the prestige of transgression, the traditional notion of 'private life', or the annoying tendency to excessive sincerity; others take a stand on the responsibility for the crisis or the deep meaning of social peace won by the rule of law; while others, in short, express the most personal voice of the author. With this book, Javier Gomá goes a step further in his determination to make a worldly philosophy, open to all, and thus offers the best possible introduction, in a thousand words, to the most serious and perennial philosophical problems.