The Manifestation of God for each age is the “real Physician” for all humanity.

Bahá'u'lláh is the real Physician. He has diagnosed human conditions and indicated the necessary treatment. The essential principles of His healing remedies are the knowledge and love of God, severance from all else save God, turning our faces in sincerity toward the Kingdom of God, implicit faith, firmness and fidelity, loving-kindness toward all creatures and the acquisition of the divine virtues indicated for the human world. These are the fundamental principles of progress, civilization, international peace and the unity of mankind. These are the essentials of Bahá'u'lláh's teachings, the secret of everlasting health, the remedy and healing for man. ('Abdu'l-Baha, 'The Promulgation of Universal Peace')