LTLietuviai ras šioje enciklopedijoje žinių ne tik apie daugybę jėzuitų, bet ir apie jų kolegijas, daug reiškusias Lietuvos Didžiosios Kunigaikštystės klestėjimui, ypač apie Vilniaus Akademiją, reikšmingiausią jėzuitų mokslo įstaigą visoje Lenkų-Lietuvių Respublikoje, kurios poveikis siekė ir už jos ribų. Autoriai, ruošę šią knygą, maloniai nustebę konstatavo, kokį didelį įnašą yra davę lietuviai jėzuitai ordino laimėjimams iki jo panaikinimo 1773 metais. Encyklopedia skiriama pirmiausia mokslo žmonėms, kurie domisi ordiną liečiančiais klausimais, jo istorija, jo veikla ir su visu tuo surištomis problemomis. Ji galėtų būti parankus žinynas apie Jėzaus Draugiją. Geografiniu požiūriu Encyklopedia apima senosios Lenkijos teritorijas (Lenkiją, Lietuvą, Latviją, Baltarusiją, Ukrainą), be Silezijos, kuri priklausė Čekijos provincijai, o nuo 1754 m. sudarė atskirą provinciją. Tačiau vis vien atsižvelgta į svarbesnes Silezijos jėzuitų įstaigas, ypač turėjusias ryšių su Lenkijos jėzuitais [Iš Pratarmės].
ENOne of the objectives of this Encyclopaedia has been to collate an updated list of the bibliography relating to the Order in Poland. The full extent of the relevant bibliography is recorded for each of the entries, even where the bibliographical matter has not been used directly in the writing of the article. The basic Jesuit and other archival resources relating to particular issues are also quoted. The annex to the Encyclopaedia presents a list of the remaining Jesuits who have not been recorded in the main body of the publication but may be found in the Jesuit catalogues (even if they were in the Order for a very short time). It was the authors’ wish to avoid creating the impression that their publication gave an exhaustive list of all the members of the Order. More information is available about those persons who are listed in the annex in the Society of Jesus’ Archives of the Province of Southern Poland. This Encyclopaedia was created over a time-span of several years within a fairly narrow group of Jesuit historians. We deliberately limited the number of contributors, so as to compose a relatively homogeneous book based on the fundamental archive materials and outside the influence of many of the conventional ideas which have flourished on the subject of the Jesuits among the Polish historians. We have tried to make the selection of entries and to write them in a cool and objective manner. At no time did we treat our task as an apology or polemic. Our only aim was to collect and describe what has been achieved hitherto, and to make generally accessible the source materials which have been unknown or not referred to up to now. We hope that the present Encyclopaedia will help in the pursuit of further research on the subject.