My comments in (parenthesis):

GOD the Father, of His graciousness regarding with unutterable loving-kindness the unhappy lot of the human race, (starts at Genesis 2) brought low by the guilt of the first man, and desiring of His exceeding great charity mercifully to restore him whom the devil’s envy overthrew by a crafty suggestion, sent from the lofty throne of heaven down to the lowly region of the world His only-begotten Son, con- substantial with Himself, who was conceived by the operation of the Holy Ghost in the womb of a fore-chosen virgin and there clothed in the garb of human flesh, and afterwards proceeding thence by the closed door of His mother’s virginity (what??), He showed Himself in a form visible to all men. For human nature, being endowed with reason, was meet to be nourished on eternal truth as its choicest food, but, held in mortal chains as a punishment for sin, its powers were thus far reduced that it had to strive to understand the invisible things of reason’s food by means of inferences drawn from visible things. The Creator of that creature became visible, clothed in our flesh, not without change in His nature 2, in order that, having become visible. He might call back to Himself, the Invisible, those pursuing after visible things, molding men by His salutary instructions and pointing out to them by means of His teaching the way of perfection: following the pattern of His holy way of life and His words of evangelical instruction, He deigned to suffer death by the torture of the cruel cross, that, by a penal end to His present life, He might make an end of the penalty of eternal death, which the succeeding generations had incurred by the transgression of their first parent, and that man might drink of the sweetness of the life of eternity from the bitter chalice of His death in time. For it behooved the Mediator between us and God to possess both transient mortality and ever- lasting beatitude, in order that by means of the transient He might be like those doomed to die and might transfer us from among the dead to that which lasts forever. He therefore offered Himself as a victim for the redemption of mankind and, overthrowing the enemy of its salvation, He snatched it from the shame of servitude to the glory of liberty, and unbarred for it the gate of the heavenly fatherland. Then, rising from the dead and ascending into heaven, He left His vicar on earth, and to him, after he had borne witness to the constancy of his love by the proof of a threefold profession, He committed the care of souls, that he should with watchfulness pay heed to and with heed watch over their salvation, for which He had humbled His high dignity; (wow does he realize he is speaking to uneducated people from another language??)  and He handed to him the keys of the kingdom of heaven by which he and, through him, his successors, were to possess the power of opening and of closing the gate of that kingdom to all. Wherefore we, though unworthy, having become, by the Lord’s disposition, the successor of this vicar, do turn our keen attention, before all else incumbent on us in virtue of our office, to your salvation and that of other men, and on this matter especially do we fix our mind, sedulously keeping watch over it with diligent zeal and zealous diligence, so that we may be able, with the help of God’s grace, to lead those in error into the way of truth and gain all men for Him. But since we are unable to be present in person in different places at one and the same time for the nature of our human condition does not allow this in order that we may not appear to neglect in any way those absent from us we send to them in our stead prudent and discreet men by whose ministry we carry out the obligation of our apostolic mission to them. It is for this reason that we have thought fit to send to you our beloved son Friar Laurence of Portugal and his companions of the Order of Friars Minor, the bearers of this letter, men remarkable for their religious spirit, comely in their virtue and gifted with a knowledge of Holy Scripture, so that following their salutary instructions you may acknowledge Jesus Christ the very Son of God and worship His glorious name by practicing the Christian religion. We therefore admonish you all, beg and earnestly entreat you to receive these Friars kindly and to treat them in considerate fashion out of reverence for God and for us, indeed as if receiving us in their persons, and to employ unfeigned honesty towards them in respect of those matters of which they will speak to you on our behalf; we also ask that, having treated with them concerning the aforesaid matters to your profit, you will furnish them with a safe-conduct and other necessities on both their outward and return journey, so that they can safely make their way back to our presence when they wish. We have thought fit to send to you the above-mentioned Friars, whom we specially chose out from among others as being men proved by years of regular observance and well versed in Holy Scripture, for we believed they would be of greater help to you, seeing that they follow the humility of our Savior: if we had thought that ecclesiastical prelates or other powerful men would be more profit- able and more acceptable to you we would have sent them. Seeing that not only men but even irrational animals, nay, the very elements which go to make up the world machine, are united by a certain innate law after the manner of the celestial spirits, all of which God the Creator has divided into choirs in the enduring stability of peaceful order, it is not without cause that we are driven to express in strong terms our amazement that you, as we have heard, have invaded many countries belonging both to Christians and to others and are laying them waste in a horrible desolation, and with a fury still unabated you do not cease from stretching out your destroying hand to more distant lands, but, breaking the bond of natural ties, sparing neither sex nor age, you rage against all indiscriminately with the sword of chastisement. We, therefore, following the example of the King of Peace, and desiring that all men should live united in concord in the fear of God, do admonish, beg and earnestly beseech all of you that for the future you desist entirely from assaults of this kind and especially from the persecution of Christians, and that after so many and such grievous offences you conciliate by a fitting penance the wrath of Divine Majesty, which without doubt you have seriously aroused by such provocation; nor should you be emboldened to commit further savagery by the fact that when the sword of your might has raged against other men Almighty God has up to the present allowed various nations to fall before your face; for sometimes He refrains from chastising the proud in this world for the moment, for this reason, that if they neglect to humble themselves of their own accord He may not only no longer put off the punishment of their wickedness in this life but may also take greater vengeance in the world to come. On this account we have thought fit to send to you our beloved son [John of Piano Carpini] and his companions the bearers of this letter, men remarkable for their religious spirit, comely in their virtue and gifted with a knowledge of Holy Scripture; receive them kindly and treat them with honor out of reverence for God, indeed as if receiving us in their persons, and deal honestly with them in those matters of which they will speak to you on our behalf, and when you have had profitable discussions with them concerning the aforesaid affairs, especially those pertaining to peace, make fully known to us through these same Friars what moved you to destroy other nations and what your intentions are for the future, furnishing them with a safe-conduct and other necessities on both their outward and return journey, so that they can safely make their way back to our presence when they wish. Lyons, 13th March 1245