We need not follow in any detail these speculations. A certain purity and loftiness marks their early stages, in which the Greek theologians were occupied in blending a sort of Platonic theory of deity with the historic fact of a noble human personality. With the emergence of the church from persecution to power, we see that the intellectual degeneracy has set in along with the moral. The first great council, that of Nicaea, occupied itself in settling by a majority of votes whether Christ was of _like_ substance with the Father or of the _same_ substance with the Father. The assertion of his full equality was in due time followed by a similar definition of the personality and equality of the Holy Spirit, with the full doctrine of the Trinity; the double nature of Christ; the rank of the Virgin Mary. The authoritative interpretation of human nature had its source in the personal experience and later theorizing of Augustine. Himself emergent after long struggles from the tyranny of evil desire, by a transcendent experience in which he saw the hand of God,--he in effect generalized from this to the inherent and utter depravity of all mankind, and its entire dependence on a divine grace which might with equal justice be given or withheld. The lurid hell which had always shared with a radiant heaven the imagination of the church took from Augustine a grimmer horror: in the fearful thought of men, its foundations were now deep sunk in eternal justice, man being himself from birth a wretch so abominable that hell was his natural destiny, save as mercy might by inscrutable selection deliver some portion of mankind. Later ages brought their own problems. What was the nature of the atonement,--a compact between God and the Devil, by which Christ was made a ransom for man, the Devil being unexpectedly cheated of his pay? Or was Christ's death simply the transfer of a debt on the books of divine justice? The sacraments, again, what was their precise nature? And so the scheme was worked out in all its details. The triune God, Father, Son, and Spirit; a hierarchy of angels; the creation of man, his seduction by a revolted and fallen angel, and the exposure of his entire posterity to the just retribution of everlasting misery; an arrangement between the persons of the Trinity by which the incarnation and death of the Son became a ransom for mankind; the establishment by Christ of a visible church, divinely guided to reveal to men the truth, and impart to them the divine grace; the offer of salvation upon condition of faith, repentance, and obedience; sacraments which were channels of divine grace; an endless heaven of bliss for the submissive and obedient, an endless hell of torment for the negligent or rebellious,--this was the universe as it existed to the belief and imagination of the Christian world for many centuries.