Sciendum est
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
It should be known.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Lat. It is to be known; be it remarked. In the books of the civil law, this phrase is often found at the beginning of a chapter or paragraph, by way of introduction to some explanation, or directing attention to some particular rule.