Albertus Magnus argued that the soul is immortal, as ex se ipsa causa, and as independent of the body; Pietro Pomponazzi maintained that the soul's immortality could be neither proved nor disproved by any natural reasons.
Again: " Existence cannot be separated from the essence of God "; compare Spinoza's ethics, definition i; " By causa sui I understand that the essence of which involves existence, or that 'which by its own nature can only be conceived as existing."
The great work that is going on is the simplification of the facts to be explained by grouping them under empirical laws; and the most general statement relating to these that can yet be made is that no single one of these laws has as yet shown signs of taking rank as a vera causa comparable with the Darwinian principle of natural selection.
The germ of this dealing with a major causa may be found in the practice of the Arian emperors in the 4th century.
It was not till the 12th century that the mitre came to be regarded as specifically episcopal, and meanwhile the custom had grown up of granting it honoris causa to other dignitaries besides bishops.