Instinct of love toward an object demands a mastery to obtain it, and if a person feels they can't control the object or feel threatened by it, they act negatively toward it.
Sigmund FreudJust as a cautious businessman avoids investing all his capital in one concern, so wisdom would probably admonish us also not to anticipate all our happiness from one quarter alone.
Sigmund FreudIt must be pointed out, however, that strictly speaking it is incorrect to talk of the dominance of the pleasure principle over the course of mental processes. If such a dominance existed, the immense majority of our mental processes would have to be accompanied by pleasure or to lead to pleasure, whereas universal experience completely contradicts any such conclusion.
Sigmund Freud