Tertullian

What, then, is the Paraclete’s administrative office but this: the direction of discipline, the revelation of the Scriptures, the reformation of the intellect, the advancement toward the “better things”? Nothing is without stages of growth: all things await their season. In short, the Preacher says, “A time to everything.” Look how creation itself advances little by little to fruitfulness. First comes the grain, and from the grain arises the shoot, and from the shoot struggles out the shrub. Thereafter boughs and leaves gather strength, and the whole that we call a tree expands. Then follows the swelling of the germen, and from the germen bursts the flower, and from the flower the fruit opens. That fruit itself, rude for a while, and unshapely, little by little, keeping the straight course of its development, is trained to the mellowness of its flavor. So, too, righteousness—for the God of righteousness and of creation is the same—was first in a rudimentary state, having a natural fear of God. From that stage it advanced, through the law and the prophets, to infancy. From that stage it passed, through the gospel, to the fervor of youth; now, through the Paraclete, it is settling into maturity.