A person may be healthy but not free due to being busy with earning a living, or he could be without need [for earning a living] and not be healthy. If the two factors come together and laziness from acts of obedience overcomes him, he is deceived. The full [picture] is that this world is a farm of the next world. In it is business whose profits will appear in the next life. So, whoever uses his free time and health in doing acts of obedience is in an enviable position, fortunate, and blessed, and whoever uses them in acts of disobedience is deceived. Because free time is followed by business, and health by sickness, even if it is only old age. 

 

Ibn al-Jawzi