It is possible to exaggerate the influence of the revived knowledge of Aristotle; but, so far as one can trace causes in the mysterious intellectual life of mankind, that influence gave scholasticism its vigour.
But more important than all this, perhaps, is the thoroughly practical tone which Guido assumes in his theoretical writings, and which differs greatly from the clumsy scholasticism of his contemporaries and predecessors.
The influence of the pseudo-Dionysian writings were transmitted to the West in the 9th century by Erigena, in whose speculative spirit both the scholasticism and the mysticism of the middle ages have their rise.
The last stage of Scholasticism preceding its dissolution is marked by the revival of Nominalism in a militant form.
The Analytics of Aristotle now entered quite definitely into the logical thought of Scholasticism and we have the contrast of a logica vetus and logica nova .
But, although the relation of reason to an external authority thus constitutes the badge of medieval thought, it would be unjust to look upon Scholasticism as philosophically barren, and to speak as if reason, after an interregnum of a thousand years, resumed its rights at the Renaissance.
In 1807, inspired by his study of Dante, he published his first work Abi lard and Dulcin, a defence of scholasticism and medieval thought.
For a generation nursed in decadent scholasticism and stereotyped theological formulae it was the fountain of renascent youth, beauty and freedom, the shape in which the Helen of art and poetry appeared to the ravished eyes of medieval Faustus.
At most, therefore, it may be admitted that the Crusades contributed to the dissolution of feudalism by putting property on the market and disturbing the validity of titles; that they aided the development of towns by vastly increasing the volume of trade; and that they furthered the growth of scholasticism by bringing the West into contact with the mind of the East.
Thus the Kabbalah linked the old scholasticism with the new and independent inquiries in learning and philosophy after the Renaissance, and although it had evolved a remarkably bizarre conception of the universe, it partly anticipated, in its own way, the scientific study of natural philosophy.