My mother had a very difficult childhood, having seen her own mother kill herself. So she didn't always know how to be the nurturing mother that we all expect we should have. ↗
Anytime you have a difficult encounter with your child, there is a good chance that at least one of these factors is bringing out the worst in him or her: transitions, time pressure, competition for your attention, conflicting objectives. ↗
Many have argued that a vacuum does not exist, others claim it exists only with difficulty in spite of the repugnance of nature; I know of no one who claims it easily exists without any resistance from nature. ↗