Ambrose of Milan

For peace and tranquillity of the soul is above all glory of any house; for peace passeth all understanding. This is that peace above all peace which shall be granted after the third shaking of the heaven, the sea, the earth and the dry land, when He shall destroy all Principalities and Powers. For heaven and earth shall pass away, and all the fashion of this world; and every man shall rise up against his brother with the sword, that is, with the word piercing the marrow of the soul, that whatever opposes itself, the chariot from Ephraim and the horse from Jerusalem may be cut off, as Zechariah says. And thus there will be peace over all, the passions of the body offering no resistance, and the unbelieving mind no obstacle, that Christ may be all in all, offering in subjection to the Father the hearts of all men.

Therefore he referred the thunders to the words of the Lord, the sound of which went out into all the earth. And we understand the word spirit in this place of the soul, which he took endowed with potential reason and perfection. For the Scripture often designates the soul of humankind by the word spirit, as you read: “Who creates the spirit of man within him.” So too the Lord signified his soul by the word spirit, when he said, “Into your hands I commend my spirit.”

Yet learn that the Son knows the day of judgment. We read in Zechariah: “And the Lord my God shall come, and all the saints with him. In that day there shall not be light but cold and frost, and it shall be one day, and that day is known to the Lord.” This day, then, was known unto the Lord, who shall come with his saints to enlighten us by his second advent. But let us continue the point that we have commenced concerning the Spirit: “He shall glorify me.” So then the Spirit glorifies the Son, as the Father also glorifies him, but the Son of God also glorifies the Spirit, as we said. He then is not weak who is the cause of the mutual glory through the unity of the eternal light, nor is he inferior to the Spirit, of whom this is true that he is glorified by the Spirit.