The Law and the Righteous

Sed in lege Domini fuit voluntas eius, et in lege eius meditabitur die ac nocte. Iusto non est lex posita, ut dicit Apostolus; sed aliud est esse in lege, aliud sub lege: qui est in lege, secundum legem agit; qui est sub lege, secundum legem agitur. Ille ergo liber est, iste servus. Deinde aliud est lex quae scribitur, et imponitur servienti; aliud lex quae mente conspicitur, ab eo qui non indiget litteris. Meditabitur die ac nocte: aut sine intermissione intellegendum est; aut die in laetitia, nocte in tribulationibus; dicitur enim: Abraham diem meum vidit, et gavisus est; et de tribulatione dicitur: 'Insuper et usque ad noctem emendaverunt me renes mei.' Sanctus Augustinus Hipponensis, De Spiritu et Littera

'But  in the law of the Lord is his will, and in His law will he meditate day and night.' 1.  'The law is not made for the righteous man,'2  says the Apostle. But it is one thing to be in the law, another under the law. He who is in the law, acts according to the law; he who is under the law, is acted upon according to the law. The former therefore is free, the latter a slave. Again, the law which is written and imposed upon the servant, is one thing, and the law which is discerned by the mind of one who needs not its 'letter,' is another. 'He will meditate  day and  night,' should be understood either as without ceasing; or 'by day' in joy, 'by night' in tribulations. For it is said, 'Abraham saw my day, and was glad.'3 and of tribulation it is said, 'Even into the night my interior has instructed me, .'4 Saint Augustine of Hippo, On the Spirit and the Letter 1 Ps 1:2 2 1 Ti 1:9  3 Jn 8:5-6  4.Ps 15.7