Which religious ideas influenced Jacob Burckhardt after he left formal Christian belief?

After abandoning his formal theological studies and the explicit profession of Christian faith, Jacob Burckhardt maintained a private religious position that can be described as a form of pantheism.1

While his early outlook was markedly romantic, his religious ideas evolved in later years to reflect a classical inspiration. This perspective, characterized by a profound respect for human destiny, eventually came to underlie his broader concept of history. Throughout his life, Burckhardt generally avoided clarifying his religious stance, preferring to keep his personal beliefs private.1