People might wish they’d never said something, and say they didn’t mean it, but for the moment they said it, they did mean it.
A human being is a mixture of different moods and selfs and characteristics. Some we find acceptable – the nice, kind parts – and others we sometimes disown, which tend to be selfish and greedy. As we get older, we push down the selfish parts so we appear nicer to other people. Unfortunately, if we don’t listen to our feelings and work out what’s making us feel bad, the part we don’t like can burst out and make us say things we later regret.