Vigilant activity; attentiveness; or care, of which there are infinite shades, from the slightest momentary thought to the most vigilant anxiety. Attentive and persistent in doing a thing; steadily applied; active; sedulous; laborious; unremitting; untiring. The attention and care required of a person in a given situation; the opposite of NEGLIGENCE.
There may be a high degree of diligence, a common degree of diligence, and a slight degree of diligence, with their corresponding degrees of negligence. Common or ordinary diligence is that degree of diligence which persons generally exercise in respect to their own concerns; high or great diligence is, of course, extraordinary diligence, or that which very prudent persons take of their own concerns; and low or slight diligence is that which persons of less than common prudence, or indeed of any prudence at all, take of their own concerns.
Special diligence is the skill that a good businessperson exercises in his or her specialty. It is more highly regarded than ordinary diligence or the diligence of a nonspecialist in a given set of circumstances.