William Burkitt on James 4:17

Observe here, 1. That sins of ignorance are sins, and render men greatly culpable, though ignorance will in some degree lessen their punishment.

Observe here, 2. That to sin against light and knowledge is a very heinous aggravation of sin; because the knowlege of our duty lays us under the greatest obligation to do it.

3. That the greater advantages and opportunities any man has of knowing his duty; and the more knowlege he sins against in not doing of it, the greater is his sin, and the more grievous will be his condemnation.