General Congregation 34 expresses well how we choose our mission

“Since the foundations of the Society, Jesuits have exercised their ministry most particularly where needs are greatest, where there are not others to minister to these needs, and where the most universal good may be found. […]
This spirit continues to shape what Jesuits do as priests: their ministry is particularly directed towards those who have not heard the Gospel, those who are at the margins of the Church or society, those who have been denied their dignity, those who are voiceless and powerless, those weak in faith or alienated from it, those whose values are undermined by contemporary culture, those whose needs are greater than they can bear”. (GC34, Decree 6, 11-12)