Tertullian

The law, however, which you find fault with, and wrest into a subject of contention, was imposed on man by Goodness, aiming at his happiness, that he might cleave to God, and so not show himself an abject creature rather than a free one, nor reduce himself to the level of the other animals, his subjects, which were free from God, and exempt from all tedious subjection; but might, as the sole human being, boast that he alone was worthy of receiving laws from God; and as a rational being, capable of intelligence and knowledge, be restrained within the bounds of rational liberty, subject to Him who had subjected all things unto him. To secure the observance of this law, Goodness likewise took counsel by help of this sanction: "In the day that thou eatest thereof, thou shalt surely die." For it was a most benignant act of His thus to point out the issues of transgression, lest ignorance of the danger should encourage a neglect of obedience. Now, since it was given as a reason previous to the imposition of the law, it also amounted to a motive for subsequently observing it, that a penalty was annexed to its transgression; a penalty, indeed, which He who proposed it was still unwilling that it should be incurred. Learn then the goodness of our God amidst these things and up to this point; learn it from His excellent works, from His kindly blessings, from His indulgent bounties, from His gracious providences, from His laws and warnings, so good and merciful.