Francis De Sales said this quote

We all colour devotion according to our own likings and dispositions. One man sets great value on fasting, and believes himself to be leading a very devout life, so long as he fasts rigorously, although the while his heart is full of bitterness;–and while he will not moisten his lips with wine, perhaps not even with water, in his great abstinence, he does not scruple to steep them in his neighbour’s blood, through slander and detraction.