Susan Sontag said this quote
“ Dissimulation, secretiveness, appear a necessity to the melancholic. He has complex, often veiled relations with others. These feelings of superiority, of inadequacy, of baffled feeling, of not being able to get what one wants, or even name it properly (or consistently) to oneself — these can be, it is felt they ought to be, masked by friendliness, or the most scrupulous manipulation. ”