III.--Fact and Faith
It may be said that the doctrine of the movement of the sun and the fixity of the earth must de Fide be held for true since the Scriptures affirm it, and all the fathers unanimously accept the scriptural words in their naked and literal sense. But it was necessary to assign motion to the sun and rest to the earth lest the shallow minds of the vulgar should be confounded, amused, and rendered obstinate and contumacious with regard to doctrines of faith. St. Jerome writes: "It is the custom for the pen-men of Scripture to deliver their judgments in many things according to the common received opinion that their times had of them." Even Copernicus himself, knowing the power of custom, and unwilling to create confusion in our comprehension, continues to talk of the rising and setting of the sun and stars and of variations in the obliquity of the zodiac. Whence it is to be noted how necessary it is to accommodate our discourse to our accustomed manner of understanding.
In the next place, the common consent of the fathers to a natural proposition should authorise it only if it have been discussed and debated with all possible diligence, and this question was in those times totally buried.
Besides, it is not enough to say that the fathers accept the Ptolemaic doctrine; it is necessary to prove that they condemned the Copernican. Was the Copernican doctrine ever formally condemned as contrary to the Scriptures? And Didacus, discoursing on the Copernican hypothesis, concludes that the motion of the earth is not contrary to the Scriptures.
Let my opponents, therefore, apply themselves to examine the arguments of Copernicus and others; and let them not hope to find such rash and impetuous decisions in the wary and holy fathers, or in the absolute wisdom of him that cannot err, as those into which they havesuffered themselves to be hurried by prejudice or personal feeling. His holiness has certainly an absolute power of admitting or condemning propositions not directly de Fide, but it is not in the power of any creature to make them true or false otherwise than of their own nature and de facto they are.
In my judgment it would be well first to examine the truth of the fact (over which none hath power) before invoking supreme authority; for if it be not possible that a conclusion should be declared heretical while we are not certain but that it may be true, their pains are vain who pretend to condemn the doctrine of the mobility of the earth and the fixity of the sun, unless they have first demonstrated the doctrine to be impossible and false.
Let us now consider how we may interpret the command of Joshua that the sun should stand still.
According to the Ptolemaic system, the sun moves from east to west through the ecliptic, and therefore the standing still of the sun would shorten and not lengthen the day. Indeed, in order to lengthen the day on this system it would be necessary not to hold the sun, but to accelerate its pace about three hundred and sixty times. Possibly Joshua used the words to suit the comprehension of the ignorant people; possibly--as St. Augustine says--he commanded the whole system of the celestial spheres to stand still, and his command to the moon rather confirms this conjecture.
On the Copernican system interpretation is simplified; for if we consider the mobility of the sun and how it is in a certain sense the soul and heart of the universe, it is not illogical to say that it gives not only light, but also motion to the bodies round it. In this manner, by the standing still of the sun at Joshua's command, the day might be lengthened without disturbing the order of the universe or the mutual positions of the stars. This interpretation also explains the statement that the sun stood still in medio coeli. Had the sun been in themiddle of the heavens in the sense of rising and setting, it had hardly been necessary to check its course; but in medio coeli probably signifies in the middle or centre of the universe where it resides.