By the time Bahá'u'lláh was fourteen, His rare understanding, His complete mastery of argument, and His unparalleled powers or exposition were remarked in all circles. Yet He was never assertive nor argumentative; rather, always courteous and patient. Only one thing aroused His ire, and that was any disrespectful reference to the Messengers or God and His Chosen Ones. Even then He would admonish the offender with kindliness and calm.
- Balyuzi (‘Bahá'u'lláh, The King of Glory’)