I have been reading the book of Job, which is not an easy thing to do. That is why it is good to read according to a schedule, that way you don't skip the hard parts.
Anyway, one of the most applicable things I read in Job is not to assume anything about anyone else. Job's three "friends" thought that they knew for sure why he was suffering, and didn't mind giving Job a piece of their mind. They were wrong, of course.
Dear Lord, help me to keep my mouth shut, and control the thoughts in my mind. Help me to be discerning in what I say, so that my words are helpful, encouraging and truthful.