Under the Reign of Terror he was arrested and imprisoned for nearly a year, during which he studied Condillac and Locke, and abandoned the natural sciences for philosophy.
Destutt de Tracy was the last eminent representative of the sensualistic school which Condillac founded in France upon a one-sided interpretation of Locke.
He pushed the sensualistic principles of Condillac to their last consequences, being in full agreement with the materialistic views of Cabanis, though the attention of the latter was devoted more to the physiological, that of Tracy to the psychological or "ideological" side of man.
She read widely though unsystematically, studying philosophy in Aristotle, Leibnitz, Locke and Condillac, and feeding her imagination with Rene and Childe Harold.
Though it never ceased to influence individual thinkers, it had handed on to Condillac its popularity with the masses.
Through Condillac, the inconsistencies were purged out, and materialism was ready for the next comer to affirm - though it may be said with R.
The impression was confirmed by the study of the English psychologists, as well as Condillac and Helvetius, and in1822-1823he established among a few friends the "Utilitarian" Society, taking the word as he tells us, from Galt's Annals of the Parish.
Condillac, Joubert, Mill and other eminent men have shown what the intellectual ascendancy of a woman can be.
Thus he accepts the shallow dictum of Condillac that toute science se reduit d une langue bien faite.
Possessed of easy means and being of hospitable disposition, he kept open house for Helvetius, D'Alembert, Diderot, Condillac, Turgot, Buffon, Grimm, Hume, Garrick, Wilkes, Sterne, and for a time J.
At first a sensualist, like Condillac and Locke, next an intellectualist, he finally shows himself a mystical theosophist.
Maine de Biran's first essays in philosophy were written avowedly from the point of view of Locke and Condillac, but even in them he was brought to signalize the essential fact on which his later speculation turns.
Condillac goes a step farther, and sees no necessity for the superstructure at all, with its need of explanation valid or invalid.
The most notable of these are Berkeley's treatment of " abstract " 1 Condillac, Langue des Calculs, p. 7.2 Locke, Essay, iii.
Laromiguiere taught the philosophy of Locke and Condillac, happily modified on some points, with a clearness and grace which in appearance at least removed difficulties, and with a charm of spiritual bonhomie which penetrated and subdued."
This teacher, as he tells us, "by the severity of his logic, the gravity and weight of his words, turned me by degrees, and not without resistance, from the beaten path of Condillac into the way which has since become so easy, but which was then painful and unfrequented, that of the Scottish philosophy."
This observational method Cousin regards as that of the 18th century, - the method which Descartes began and abandoned, and which Locke and Condillac applied, though imperfectly, and which Reid and Kant used with more success, yet not completely.
Condillac, in the same spirit, says of him, " personne n'a mieux connu que lui la cause de nos erreurs."