[3] Cabanis, 1757-1808, _Rapports du Physique et du Morale de l’Homme_, 1802. He was a friend of De Biran, as also was Ampère, the celebrated physicist and a man of considerable philosophical power. A group used to meet _chez Cabanis_ at Auteuil, comprising De Biran, Cabanis, Ampère, Royard-Collard, Guizot, and Cousin. [4] Condillac belongs to the eighteenth century. He died in 1780. His _Traité des Sensations_ is dated 1754. It is the special merit of De Biran that he endeavoured, and that successfully, to establish both the concreteness and the essential spirituality of the inner life. The attitude and method which he adopted became a force in freeing psychology, and indeed philosophy in general, from mere play with abstractions. His doctrines proved valuable, too, in establishing the reality and irreducibility of the mental or spiritual nature of man. Maine de Biran took as his starting-point a psychological fact, the reality of conscious effort. The self is active rather than speculative; the self is action or effort—that is to say, the self is, fundamentally and primarily, will. For the Cartesian formula _Cogito, ergo sum,_ De Biran proposed to substitute that of _Volo, ergo sum_. He went on to maintain that we have an internal and immediate perception of this effort of will through which we realise, at one and the same time, our self in its fullest activity and the resistance to its operations. In such effort we realise ourselves as free causes and, in spite of the doctrine of physical determinism, we realise in ourselves the self as a cause of its own volitions. The greater the resistance or the greater the effort, the more do we realise ourselves as being free and not the absolute victims of habit. Of this freedom we have an immediate consciousness, it is _une donnée immédiate de la conscience._ This freedom is not always realised, for over against the tendency to action we must set the counter-tendency to passivity. Between these two exists, in varying degrees of approach to the two extremes, _habitude_. Our inner life is seen by the psychologist as a field of conflict between the sensitive and the reflective side of our nature. It is this which gives to the life of this _homo duplex_ all the elements of struggle and tragedy. In the desires and the passions, says Maine de Biran, the true self is not seen. The true self appears in memory, reasoning and, above all, in will.