'Abdu'l-Baha says in a letter to the Baha'is of America: Beware! Beware! Lest ye offend any heart!
Beware! Beware! Lest ye hurt any soul!
Beware! Beware! Lest ye deal unkindly toward any person!
Beware! Beware! Lest ye be the cause of hopelessness to any creature! (56:2)

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