Sri Aurobindo
Letters of Sri Aurobindo
9. Fate and Free-Will, Karma and Heredity, etc
In the case of Socrates and that of the habitual drunkard raised by you, the difference you make is correct. The weak-willed man is governed by his vital and physical impulsions, his mental being is not dynamic enough to make its will prevail over them. His will is not “free” because it is not strong enough to be free, it is the slave of the forces that act on or in his vital and physical nature. In the case of Socrates the will is so far free that it stands above the play of these forces and he determines by his mental idea and resolve what he shall or shall not do. The question remains whether the will of Socrates is only free in this sense, itself being actually determined by something larger than the mentality of Socrates, something of which it is the instrument – whether the Universal Force or a Being in him of which his daemon was the voice and which not only gave his mind that decisive awareness of the mental ideal but imposed on it the drive to act in obedience to the awareness. Or it may be subject to a nexus between the inner Purusha and the Universal Force. In the latter case there would be an unstable balance between the determinism of Nature and a self-determination from within. If we start from the Sankhya view of things, that being (viz., the one of which his daemon was the voice) would be the soul or Purusha and both in the strong-willed Socrates and in the weak-willed slave of vital impulse, the action and its results would be determined by the assent or refusal of the Purusha. In the 
latter the Purusha gives its assent to and undergoes the play of the forces of Nature, the habit of the vital impulse, through a vital submission while the mind looks on helpless. In Socrates the Purusha has begun to emancipate itself and decide what it shall accept or shall not accept – the conscious being has begun to impose itself on the forces that act on it. This mastery has become so complete that he can largely determine his own actions and can even within certain limits not only forecast but fix the results – so that what he wants shall happen sooner or later.
As for the Superman, that is the conscious being whose emancipation is complete by his rising to a station beyond the limits of mind. He can determine his action in complete accord with an awareness which perceives all the forces acting in and on and around him and is able, instead of undergoing, to use them and even to determine.