Ratio Legis Est Anima Legis
Defined in 3 dictionaries — Cyclopedic (1922), Ballentine's (1916), Black's (1910)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The reason of the law is the soul of the law. Jenk. Cent. Cas. 45.
Ballentine's Law Dictionary
James A. Ballentine · 1916
The reason of the law is the spirit of the law.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Jenk. Cent. 45. The reason of law is the soul of law.