Self-deception is familiar to everyone, yet it is difficult to understand. It presents itself as a paradoxical, contradictory phenomenon. How it becomes possible, how someone can deceive and betray themselves, remains an open question, and one might debate the extent to which there are actual cases of true self-deception. Behaviors related to self-concealment, insincerity, and denial of awareness hold an undeniable significance in human life. They can be opaque and unavoidable for the individual, and they may prove useful in both individual and social life, even being seen as benevolent for one’s own way of living. However, self-deceptions can also be accompanied by suffering and self-sabotage, hindering one’s actions, causing emotional distress, and raising moral concerns.