Slight care or diligence is such as persons of ordinary prudence usually exercise about their own affairs of slight importance; ordinary care or diligence is such as they usually exercise about their own affairs of ordinary importance; and great care or diligence is such as they usually exercise about their own affairs of great importance. R.L.1910, § 2917.
Degrees of care defined
25 O.S. § 4, under Definitions and General Provisions.
25 O.S. § 4