Subjectivity
The author argues against the accusation of subjectivity, which is used as an argument against existentialism. The subjectivity in the terms of existentialism isn't used as a form to dignify humankind. It is rather used to describe the human condition as a being that exists and projects itself while being conscious of it. The author describes this subjectivity as man existing only by projection of himself. This projection in turn affects the entirety of mankind in the sense that it creates the image of a man as it should be in his mind.
Anguish, abandonment, and despair
Anguish, as viewed in existentialism, is man's awareness of his responsibility for humanity. In making a choice, the man makes himself conscious of its effect on humanity. Abandonment is the denial of the existence of God according to the existentialism. Man is abandoned, and he is the only one responsible for his choices, he is the one who creates his future and decides what to be. Despair is connected to probability in existentialism, meaning that choices are made according to the circumstantial knowledge rather than fate in the kindness of humanity.