The third principle of Bahá’u’lláh is:

Religion should be the Cause of Love and Affection Religion should unite all hearts and cause wars and disputes to vanish from the face of the earth, give birth to spirituality, and bring life and light to each heart. If religion becomes a cause of dislike, hatred and division, it were better to be without it, and to withdraw from such a religion would be a truly religious act.
For it is clear that the purpose of a remedy is to cure; but if the remedy should only aggravate the complaint it had better be left alone. Any religion which is not a cause of love and unity is no religion. All the holy prophets were as doctors to the soul; they gave prescriptions for the healing of mankind; thus any remedy that causes disease does not come from the great and supreme Physician.
 
`Abdu'l-BaháParis: Talks