Intellect
From Bahai9
Sign of intellect is contemplation and sign of contemplation is silence[edit]
"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, Paris Talks, p. 174)