When this impulse to the highest individual development[301] was combined with a powerful and varied nature, which had mastered all the elements of the culture of the age, then arose the ‘all-sided man’--‘l’uomo universale’--who belonged to Italy alone. Men there were of encyclopædic knowledge in many countries during the Middle Ages, for this knowledge was confined within narrow limits; and even in the twelfth century there were universal artists, but the problems of architecture were comparatively simple and uniform, and in sculpture and painting the matter was of more importance than the form. But in Italy at the time of the Renaissance, we find artists who in every branch created new and perfect works, and who also made the greatest impression as men. Others, outside the arts they practised, were masters of a vast circle of spiritual interests. Dante, who, even in his lifetime, was called by some a poet, by others a philosopher, by others a theologian,[302] pours forth in all his writings a stream of personal force by which the reader, apart from the interest of the subject, feels himself carried away. What power of will must the steady, unbroken elaboration of the ‘Divine Comedy’ have required! And if we look at the matter of the poem, we find that in the whole spiritual or physical world there is hardly an important subject which the poet has not fathomed, and on which his utterances--often only a few words--are not the most weighty of his time. For the plastic arts he is of the first importance, and this for better reasons than the few references to contemporary artists--he soon became himself the source of inspiration.[303] The fifteenth century is, above all, that of the many-sided men. There is no biography which does not, besides the chief work of its hero, speak of other pursuits all passing beyond the limits of dilettantism. The Florentine merchant and statesman was often learned in both the classical languages; the most famous humanists read the ethics and politics of Aristotle to him and his sons;[304] even the daughters of the house were highly educated. It is in these circles that private education was first treated seriously. The humanist, on his side, was compelled to the most varied attainments, since his philological learning was not limited, as it now is, to the theoretical knowledge of classical antiquity, but had to serve the practical needs of daily life. While studying Pliny,[305] he made collections of natural history; the geography of the ancients was his guide in treating of modern geography, their history was his pattern in writing contemporary chronicles, even when composed in Italian; he not only translated the comedies of Plautus, but acted as manager when they were put on the stage; every effective form of ancient literature down to the dialogues of Lucian he did his best to imitate; and besides all this, he acted as magistrate, secretary, and diplomatist--not always to his own advantage.