when to call on a Doctor?

1. We get stricken by an infirmity and we call on a doctor.

2. We are not recovering from an infirmity or for some reason the infirmity has prolonged that we call on a doctor.

The former believes that all infirmities require a doctors attention.
The latter believes only those his body can't handle require the attention of a doctor.

The former is not presumptuous about anything.
The latter is presumptuous about most things.