Look at your own mind. The one who carries things thinks he's got things, but the one who looks on only sees the heaviness. Throw away things, lose them and find lightness. (Ajahn Chah, "No Ajahn Chah")
There is a saying, "To catch two birds with one stone." That is what people usually try to do. Because they want to catch too many birds they find it difficult to be concentrated on one activity, and they may end up not catching any birds at all!
When we start attacking somebody else verbally with the intent to ruin their reputation, we are actually saying more about ourselves and our own faults, than we are about the person whom we are bad-mouthing.