"I can certainly see how people are overcome by depression"

In this quote, Stuart Appleby is expressing his understanding and empathy towards those who fight with depression. He acknowledges that anxiety can be an effective force that can overwhelm and consume people. By saying "I can certainly see," he is indicating that he has actually seen or experienced the effects of anxiety firsthand. This statement also suggests that he recognizes the intricacy and severity of depression, which it is not something that can be quickly brushed off or overlooked. In general, Appleby's words convey a sense of empathy and understanding towards those who cope depression.