We are apt to wonder now how people were ever so psychologically impious as to attempt to teach in a single group, by means of the same cut-and-dried phrases, minds at every different stage of growth and of receptiveness; hurling ready-made truths at the devoted heads of pupils like so many tons of explosive bombs shot down from aircraft upon massed enemy battalions! Grading, and the individual point of contact—which, after all, is just Aristotle’s time-honoured principle of “beginning from that which we know”—these we recognise to be of the first importance, and that whether we be University professors or Sunday school teachers. And so we are prepared to appreciate a fourteenth century scheme which is dominated by the principle of graded progress.

We note that the souls which are not yet psychologically fit to begin the regular course of purgation are kept outside, in Antepurgatory, for a longer or shorter term of years, as each has need. The “Infants,” so to speak, are graded among themselves, and are not grouped with “Standard I.” Within the Gate, the seven terraces are arranged in an order corresponding (not, of course, to a psychological series that would be accepted as it stands to-day, but) to a very carefully-thought-out classification of the seven capital sins; and until the lesson of a given Terrace is completely mastered, there is no chance of moving up. When, on the other hand, the teaching in that particular grade has been thoroughly grasped and the pupil has nothing more to learn there, no power in heaven or earth—or anywhere else—can keep him back. In Dante’s School there are no mistakes in grading, and no wrong removes.

We have spoken of the “atmosphere” of the Purgatorio as one of “naturalness,” meaning by that, that it is an environment not calculated to hamper or restrict normal and spontaneous development. It is “natural” also in a more literal sense, in that the Poet has seen fit to depart from the almost invariable tradition of his predecessors (who place Purgatory underground, side by side with Hell, and make it scarcely distinguishable therefrom save in the matter of duration) and to furnish his penitents with an “open-air cure.”

It is this background of noble scenery, of landscape and skyscape, of slope and scarp, of Flowery Valley and Divine Forest, of star-light and dawn, of sunrise and high noon and sunset—it is this that gives its peculiar beauty to the second Cantica of the Divine Comedy. But this open-air Purgatory is more than a clever artifice, by which a fine dramatic contrast is produced after the murk and gloom of the Inferno. It is, as we have seen, essential to Dante’s conception of the perfect work of penitence in man, that it should draw his footsteps up to the Earthly Paradise, the primal home of Innocence. And so the background of the Purgatorio, as it were inevitably, completes the illusion of “naturalness” in the world beyond, and enforces the parallel between the upward struggle of those elect spirits and our own daily pilgrimage in this life. It suggests further, all that the magic phrase “Open Air” means to our modern ears: that healthy out-door life, nurse of the mens sana in corpore sano, that life of robust activities in close contact with external Nature of which the prime importance is recognised by all schools of thought in the world of modern education.

Finally (and here we touch upon one of the most beautiful features of Dante’s conception), the spiritual atmosphere, in spite of purgatorial framework of the Seven Sins, is not that of the Decalogue, but of the Beatitudes. The Sins themselves are interpreted as disordered Love, and the manifold love which goes up to make a Saint is expressed in sweetest harmony when each successive barrier is passed.[217] Love is the atmosphere, and Love the supreme lesson, the learning whereof continues beyond the grave.

The conception of Love as the universal motive power, expressed at length in Purg. xvii. 91 sqq.

Nè creator nè creatura mai

Cominciò el, figliuol, fu sanza amore ...

suggests a comparison of Dante’s psychology with that of the most modern school. In an age when (as a glance at Fra Salimbene’s pages will demonstrate)—pages written, it must be remembered, for the eye of a Sister of the Order of Sta Clara!—something more than Elizabethan broadness of speech was not uncommon, Dante pours out volumes of prose and verse, every line of which may be said to be suitable pour les jeunes filles. He would scarcely have subscribed to that domination of the Sex-instinct which is an axiom of the Freudian psychology. In the lines referred to above he more or less adumbrates the doctrine of “Libido”; but it does not occur to him to label that psychic force with so doubtfully reputable a name as “Libido.” The noble title “Amor” is for him, as for earlier philosophers, the more appropriate one.

It would, of course, be absurd to credit Dante with the place of a pioneer of the twentieth century psychology of the Unconscious, which had its roots in the Psychical Research of F. W. Myers and his friends, and sprouted up to visible life and growth so recently under the hands of the Viennese Freud and the Switzer Jung. But it would probably not be too much to say, in view of his remarkably intelligent interest in mental processes, and especially in the phenomena of dreams and of the border-land between sleeping and waking, that, given the assets and the advantages of our modern thinkers, he would have taken no mean place among psychologists of the modern type.