The following five sentences, labeled 1 to 5, relate to a single topic. Four of these sentences can be arranged to form a logical paragraph. Identify the sentence that does not fit with the others and enter its number as your answer.

1. Authentic existence, in existentialist thought, is fundamentally predicated upon an individual's radical freedom to define their own essence through conscious choice and action, unburdened by predetermined roles or societal expectations.
2. The intellectual genesis of existentialism can be traced back to 19th-century thinkers like Søren Kierkegaard and Friedrich Nietzsche, whose profound emphasis on individual will, subjective experience, and the void of conventional morality laid crucial groundwork for later developments.
3. This profound freedom, however, concurrently imposes an overwhelming burden of responsibility for one's choices, as individuals are effectively condemned to be free and must forge their values without recourse to external justification.
4. Thus, authentic living is not a static state but a perpetual process of confronting the anguish of groundlessness and actively engaging in self-overcoming, perpetually re-evaluating and reaffirming one's chosen path.
5. To shy away from this self-creation, often by succumbing to external pressures or adopting pre-fabricated identities, constitutes "bad faith" or inauthenticity, wherein one denies their fundamental freedom and evades responsibility.