Another source of harm is this: we may judge others unfavourably, though they may be holier than ourselves, because they do not walk as we do... You think such people are imperfect; and if they are good and yet at the same time of a lively disposition, you think them dissolute....It is very wrong to think that everyone who does not follow in your own timorous footsteps has something the matter with her...
Try, then, sisters, to be as pleasant as you can, without offending God, and to get on as well as you can with those you have to deal with, so that they may like talking to you and want to follow your way of life and conversation, and not be frightened and put off by virtue. This is very important for nuns: the holier they are, the more sociable they should be with their sisters. Although you may be very sorry if all your sisters’ conversation is not just as you would like it to be, never keep aloof from them if you wish to help them and to have their love. We must try hard to be pleasant, and to humour the people we deal with and make them like us, especially our sisters.
So try, my daughters, to bear in mind that God does not pay great attention to all the trifling matters which occupy you, and do not allow these things to make your spirit quail and your courage fade, for if you do that you may lose many blessings. As I have said, let your intention be upright and your will determined not to offend God. But do not let your soul dwell in seclusion, or, instead of acquiring holiness, you will develop many imperfections, which the devil will implant in you in other ways, in which case, as I have said, you will not do the good that you might, either to yourselves or to others.
(Text from Christian Classics Ethereal Library)