Bahá’u’lláh says there is a sign (from God) in every phenomenon: the sign of the intellect is contemplation and the sign of contemplation is silence, because it is impossible for a man to do two things at one time—he cannot both speak and meditate.
- ‘Abdu’l-Bahá (From a talk; Paris Talks: Addresses given by ‘Abdu’l-Bahá in Paris in 1911–1912)