Man ''does not know anything on his essence'' : ''The Being and Nothing''(Sartre :''or in French :''L'Etre et le Neant''.)
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Existence annulates the essence of things and turns their
substance to being or to an annulated being.., as man does not knoe anyting from his substance, and Being, in the measure of ''being free'' as he's defined throughout freedom, and his attitude of being free.
Just as existence is free, and ''condemned'' to its freedom, it lives throughout its big privilege, its autonomy. is it may be a start to its imposure onto Being, by its own free will?
A combined realistic and idealist aspect (of pour soi to en soi, and vice versa, thus : to the being ''for'' into to ''being'' for ''oneself'') so that man's freedom finds, locate its roots (reasons)for exiestence: In a purely existential level, this aspect fails but, in socio-ideology level, the Idea is liberation of existence, from its dry autonomy, and existence finds its identity throughout Idea, therefore throughout its own self expression. Because Idea, as a derivate of Freedom, adjuncts to things an identity that corresponds to a more evolved form of freedom..There, there is a subtle point between Sartre and Marx to be found.
From one hand, freedom itself, exempts man's self-substance, and on the other hand a relative meaning, that gains an ''image''according to circumstances and conditions. The point is to what extent, could free man build up society based on freedom, that in its base, does not ''recongnize'' any compromise and rules human relationships in physical level; in my opinion, an answer us that fredom is bing grown a bit;that's why this is a bridge gap of both sides, more generally of ideology, that this is the means of all factors, that cordinate human relatioships, social relatioships in their totality, according Marx; throughout social relioships, freedom is deplored in all its versions, personal, social and historical in general;it has to do with undertaking responsibility in all above fields, in which a comparisosn measure is the measure of ''possible'' , the potentially being : therefore in view of liberty (freedom), static man's essence is liberated and becomes dynamic, throughout which man can ''test'' himself; because freedom means committment or self-committment;committed to choices, self-committment as one undertakes oneself as a whole; thus free will is determined in some way, no matter how free it is. Because free will has to do with determnism (necessity of things) apart from free option..Therefore freedom and necessity can touch the same level point, appreciation of reality as a whole and self-apppreciation. Therefore without this last free point, freedom would just be something that would simply make human ''substance''an eternal and static substance, withiut giving ''substance'' to man..himself..however this last one, occurs.