We are to learn our duty from the Lord, and then we are to act in all diligence, never being lazy or slothful. The pattern is simple but not easy to follow. We are so easily distracted.
The ear tends to be lazy, craves the familiar and is shocked by the unexpected; the eye, on the other hand, tends to be impatient, craves the novel and is bored by repetition.
Our bodies must always be wherever that struggle and the moment we forget that, the moment we become lazy, the moment we sit back, then then the evil ones do their ordained tasks to us.