The whole world is represented by the figure of a tree, of which the seeds and roots are the first indeterminate matter, the leaves the accidents, the twigs and branches corruptible creatures, the blossoms the rational soul, and the fruit pure spirits or angels.
23 that they have been begotten again, not of corruptible seed, but of incorruptible through the word of God.
The scholastic distinctions between corruptible and incorruptible substances, between absolute gravity and absolute levity, between natural and violent motions, if they did not wholly disappear from scientific phraseology, ceased thenceforward to hold the place of honour in the controversies of the learned.
Discarding these obscure and misleading notions, Galileo taught that gravity and levity are relative terms, and that all bodies are heavy, even those which, like the air, are invisible; that motion is the result of force, instantaneous or continuous; that weight is a continuous force, attracting towards the centre of the earth; that, in a vacuum, all bodies would fall with equal velocities; that the "inertia of matter" implies the continuance of motion, as well as the permanence of rest; and;:that the substance of the heavenly bodies is equally "corruptible" with that of the earth.
Severus laid such stress on the human infirmities of Christ as proving that His body was like ours, created and corruptible (09ap-rov) that his opponents dubbed him and his followers Phthartolatrae - worshippers of the corruptible.2 The school of Themistius of Alexandria extended the argument to Christ's human soul, which they said was, like ours, limited in knowledge.