Solitude Is The Profoundest Fact Of The Human Condition. Man Is The Only Being Who Knows He Is Alone, And The Only One Who Seeks Out Another. His Nature - If That Word Can Be Used In Reference To Man, Who Has ‘invented’ Himself By Saying ‘no’ To Nature - Consists In His Longing To Realize Himself In Another. Man Is Nostalgia And A Search For Communion. Therefore, When He Is Aware Of Himself He Is Aware Of His Lack Of Another, That Is, Of His Solitude.