Abstract
From the beginnings of philosophical investigation, there has been widespread recognition that reason must be autonomous to think the truth and that philosophy must be the freest of all disciplines. Nonetheless, conceiving how self-determination can be in thought and reality seems to pose insurmountable challenges. The essay shows how these challenges can be met, explaining how the nature of the concept enables reason to be autonomous, how nature can give rise to animal life, providing the enabling conditions for linguistic intelligence, how the psychological and cultural conditions of discourse leave it free, and how conduct can achieve self-determination in the intersubjective exercise of institutionalized rights.