What if we were made to believe in ambition because ambition is something good? There is a mantra that tells us “be ambitious”, but, who dares to dissent from it? What if ambition would have been politicized and ideologized? The reason for writing this book is not to clarify what ambition actually means, but to unpack the ethical implications behind its different meanings. This book is divided in three parts corresponding to three different ethos or ways of living : being ambitious, not being ambitious and, finally, being ambitious and not ambitious at the same time.