I heard once from A Chossid – that the great trick of the Yetzer Hara which really Tanya refers to – is that because certain stimuli is negative, be it pain, guilt or shame – therefore as a human being by nature seeks to feel good and not suffer… – The Yetzer Hara knows by inducing with these emotions – we can then easily turn to self-destructive behaviors such as addiction, sadism, arrogance etc.