" The situation, then, which it regards as a ‘danger’ and against which it wants to be safeguarded is that of non-satisfaction, of a growing tension due to need, against which it is helpless. I think that if we adopt this view all the facts fall into place. The situation of non-satisfaction in which the amounts of stimulation rise to an unpleasurable height without its being possible for them to be mastered psychically or discharged must for the infant be analogous to the experience of being born—must be a repetition of the situation of danger. What both situations have in common is the economic disturbance caused by an accumulation of amounts of stimulation which require to be disposed of. It is this factor, then, which is the real essence of the ‘danger’. "

― Sigmund Freud , Inhibitions, Symptoms and Anxiety