Opinion involves belief (for without belief in what we opine we cannot have an opinion), and in the brutes though we often find imagination we never find belief.
These two rational faculties may be designated the Scientific Faculty and the Calculative Faculty respectively; since calculation is the same as deliberation, and deliberation is never exercised about things that are invariable, so that the Calculative Faculty is a separate part of the rational half of the soul.
Remember, too, every day, and whenever you can, repeat to yourself, Lord, have mercy on all who appear before Thee today. For every hour and every moment thousands of men leave life on this earth, and their souls appear before God. And how many of them depart in solitude, unknown, sad, dejected that no one mourns for them or even knows whether they have lived or not!
The soul must have its chosen sewers to carry away its ordure. This function is performed by persons, relationships, professions, the fatherland, the world, or finally, for the really arrogant - I mean our modern pessimists - by the Good God himself.
The soul is something which contains the body. The body doesn't contain the soul. The soul, if we put it into modern language, is the entire complex of relationships in whose context this organism exists.