'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!
Should one become the cause of grief to any one heart, or of despondency to any one soul, it were better to hide oneself in the lowest depths of the earth than to walk upon the earth (56:2)

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