" Gordon MacDonald once wrote about how what he called the “sinkhole syndrome” happens in a human life. It may be triggered by a failure at work, a severed relationship, harsh criticism from a parent, or for no apparent reason at all. But it feels like the earth has given way. It turns out, MacDonald wrote, that in a sense we have two worlds to manage: an outer world of career and possessions and social networks; and an inner world that is more spiritual in nature, where values are selected and character is formed — a place where worship and confession and humility can be practiced. Because our outer worlds are visible and measurable and expandable, they are easier to deal with. They demand our attention. “The result is that our private world is often cheated, neglected because it does not shout quite so loudly. It can be effectively ignored for large periods of time before it gives way to a sinkhole-like cave-in.” He quotes the haunting words of Oscar Wilde: “I was no longer captain of my own soul.” The sinkhole, says MacDonald, is the picture of spiritual vulnerability in our day. "

― John Ortberg , Soul Keeping: Caring For the Most Important Part of You