The Tablet to Dr Forel is letter written by ‘Abdu’l-Bahá in 1921 in reply to a letter from Dr Auguste-Henri Forel, a Swiss myrmecologist, neuroanatomist and psychiatrist. In this Tablet ʻAbdu'l-Bahá addresses the differences between the mineral, vegetable, animal and human kingdoms, the spiritual nature of man, and proofs of the existence of God.