There may be babblers, wholly ignorant of mathematics, who dare to condemn my hypothesis, upon the authority of some part of the Bible twisted to suit their purpose. I value them not, and scorn their unfounded judgment.

For a traveler going from any place toward the north, that pole of the daily rotation gradually climbs higher, while the opposite pole drops down an equal amount.

More stars in the north are seen not to set, while in the south certain stars are no longer seen to rise.

Therefore, having obtained the opportunity from these sources, I too began to consider the mobility of the earth.

In the midst of all dwells the sun.

Although all the good arts serve to draw man's mind away from vices and lead it toward better things, this function can be more fully performed by this art, which also provides extraordinary intellectual pleasure.

Mathematics is written for mathematicians.