Law is twofold -- natural and written. The natural law is in the heart, the written law on tables. All men are under the natural law.
AmbroseWe ask for what reason our Lord was unwilling to state the time of His coming (cf. Mk. 13:31-32). If we ask it, we shall not find it is owing to ignorance, but to wisdom. For it was not to our advantage to know; in order that we being ignorant of the actual moments of judgment to come, might ever be as it were on guard, and set on the watch-tower of virtue, and so avoid the habits of sin; lest the day of the Lord should come upon us in the midst of our wickedness.
AmbroseDo not desert a friend in time of need, nor forsake him nor fail him, for friendship is the support of life. Let us then bear our burdens as the Apostle has taught (cf. Gal. 6:2): for he spoke to those whom the charity of the same one body had embraced together. If friends in prosperity help friends, why do they not also in times of adversity offer their support? Let us aid by giving counsel, let us offer our best endeavors, let us sympathize with them with all our heart.
AmbroseWe must follow the ways of the Lord, and take heed to our own ways, lest they lead us into sin. One can take heed if one is not hasty in speaking. The law says: 'Hear, O Israel, the Lord your God' (Dt. 6:4). It said not: 'Speak,' but 'Hear.' Eve fell because she said to the man what she had not heard from the Lord her God. The first word from God says to you: Hear!
AmbroseThe Church was redeemed at the price of Christ's blood. Jew or Greek, it makes no difference; but if he has believed, he must circumcise himself from his sins [in baptism (Col. 2:11-12)] so that he can be saved . . . for no one ascends into the kingdom of heaven except through the sacrament of baptism . . . "Unless a man be born again of water and the Holy Spirit, he cannot enter the kingdom of God"
Ambrose