What is brought out by these exhort- ations is an inability to fix the heart and mind upon Christ and make Him the chief object of devotion and attention. Lest at any time we should let them slip' 1. That is a nautical phrase describing what happens to a craft that isn't anchored. Without our hearts and minds fixed upon Christ we are carried away by the currents of the world around us. The same is true in the natural realm as well.
Children are unable to deliberately focus their attention and control their concentration.
Consequently, they devote themselves at will to a new activity. The more mature the child, the longer they can concentrate on any one activity. A Lack of Appetite. Once again an illustration from the natural realm illuminates the world of the Spirit. C. Three periods of life when we cannot digest 'strong meat'.