As the result of careful observation. See on Luk 10:18.
Hurt (ὕβρεως)
The word literally means insolence, injury, and is used here metaphorically: insolence of the winds and waves, “like our 'sport' or 'riot' of the elements” (Hackett). Some take it literally, with presumption, as indicating the folly of undertaking a voyage at that season; but the use of the word in Act 27:21 is decisive against this.
Damage (ζημίας)
Better, as Rev., loss. Hurt and damage (A. V.) is tautological. See on the kindred verb, notes on lose, Mat 16:26, and east away, Luk 9:25.