Identity is, for the presocratics, to be differentiated while for plato difference is to be identified.
Identity is absolutely negativity because the notion has its complete external objectivity in nature.
Identity is itself a radical difference, not a simple reification as is often presumed in that identity always emerges only through a process of self-relating, of negating all determinate properties.
Identity is a state of being where there's nothing to write about, where one contains all subjects as potential, instead of being subjected to events.
Identity is an act. It is not something permanent, given, or substantial that one has, but is something one has to become, to seek out in an open process of exposure to others and to internal difference.
Identity is difference which pulsates within itself but does not move, inwardly vibrates, yet is at rest. It is self-identical for the differences are tautological... they are differences that are none.
Identity is always contingent and precarious, temporarily fixed at the intersection of various subject positions, constructed by a diversity of discourses among which there is no necessary relation, but rather a constant movement of overdetermination and displacement.
Identity is a form of subjugation and a way of exercising power over people and preventing them from moving outside fixed boundaries.