St. Teresa on False Humility: "Devil..make us very uneasy about the gravity of our past sins..so that in time we withdraw from Communion & give up our private prayer..devil suggests to us that we are not worthy..we spend the time during which we ought to be receiving grace in wondering whether we are properly prepared or no"

https://ccel.org/ccel/teresa/way/way.i.xlv.html

CHAPTER 39

Continues the same subject and gives counsels concerning different kinds of temptation. Suggests two remedies by which we may be freed from temptations.135

Beware also, daughters, of certain kinds of humility which the devil inculcates in us and which make us very uneasy about the gravity of our past sins. There are many ways in which he is accustomed to depress us so that in time we withdraw from Communion and give up our private prayer, because the devil suggests to us that we are not worthy to engage in it. When we come to the Most Holy Sacrament, we spend the time during which we ought to be receiving grace in wondering whether we are properly prepared or no. The thing gets to such a pass that a soul can be made to believe that, through being what it is, it has been forsaken by God, and thus it almost doubts His mercy. Everything such a person does appears to her to be dangerous, and all the service she renders, however good it may be, seems to her fruitless. She loses confidence and sits with her hands in her lap because she thinks she can do nothing well and that what is good in others is wrong in herself.