In the life of study, sooner or later, one has to develop the ability to deal with the paradox that one should or should only read what one wants to retain, although knowledge of piles and piles of books is necessary for progress in any serious study. There is never a definitive solution to this dilemma. It is necessary to read, and to read slowly; but the real interest that sustains attentive reading wants to go after sources, wants to broaden one’s understanding more and more: the result is a list of next readings that only grows, indefinitely. It soon becomes clear that it is not possible to read everything one wants to, that one has to choose. But choosing is another problem: it is necessary to mix the safe with the mysterious, the unexplored, because one never knows exactly what can be found in them. Finally, the study has to delve into lists, titles and indexes, and if it does not find everything it’s looking for, it has to recognize that finitude necessarily denotes a limit to what can be sought.