Calming Quotes For Anxiety and Depression. Sudden panic or anxiety attacks without any obvious trigger are common, as is constant nagging worries. Anxiety disorders carry many different symptoms that involve thoughts, self-protective behaviors, avoidant behaviors, and fear of undetermined future events. The anxiety often interferes with daily activities and day-to-day life. Generalized anxiety disorder is believed to be caused at least in part by a malfunction in brain chemistry. These calming quotes will help you relieve anxiety and depression, and help you think positively.