Saints detect the good qualities in people that were generally undiscovered by others. We should avoid speking of the negative qualities of people

(from "Reminiscences of Kunju Swami"):

Kunju Swami: Bhagavan’s tongue never spoke of the negative qualities of people. When news of someone’s death was brought to him he would at once recall the virtuous qualities of the deceased. He had an uncanny gift for detecting the good qualities in people that were generally undiscovered by others. His words would come as a revelation to us about the person concerned, and we would be amazed at Bhagavan’s discovery of these virtuous qualities in them. So much so that we used to feel that it would even be worth dying to earn these words of high praise from Bhagavan. Well, I can only say that we were not fortunate enough!

Whenever news came of someone’s demise we would rush to sit before Bhagavan to hear what Bhagavan would say of the deceased’s virtues. Kandaswami of Tiruvannamalai town, a well-to-do man, was disliked by all because of his offensive manners. Once in a long while Kandaswami came for Bhagavan’s darśan. His last days were ridden with poverty and ill health and he even had to take shelter at the maṇṭapam in front of the āśram. He sent word through someone that he wanted to taste some Kerala gruel. Bhagavan asked us to make it and send it to him. We did so that day and on the following day too. Kandaswami’s condition worsened. We became curious about what Bhagavan would have to say about this person when he passed away. We were particularly eager because the man was devoid of anything worthy of mention. The next day he died.

Reporting the news to Bhagavan we sat down in front of him. We were cocksure that even Bhagavan would not be able to find anything good to say about him. We were in for a surprise. Bhagavan said, “Kandaswami had no match where keeping body and clothes clean was concerned. In this respect, he is next only to Injikkollai Deekshitar. Kandaswami would neither apply oil nor use soap. He would come to the pond at eight and wash his dhotī clean by repeated squeezing and wringing, and then thoroughly scrub his limbs and body. And by the time he finished all this, it would be twelve noon. Even his hair and beard were always very, very clean.” On listening to Bhagavan’s words we had to hang our heads in shame at ourselves. Isn’t Bhagavan unparalleled in finding only what is good in people?