The greatest hazard of all, losing one’s self, can occur very quietly in the world, as if it were nothing at all.

“The greatest hazard of all, losing one’s self, can occur very quietly in the world, as if it were nothing at all. No other loss can occur so quietly; any other loss - an arm, a leg, five dollars, a wife, etc. - is sure to be noticed.” 
― Søren Kierkegaard, The Sickness Unto Deathlike