Sadness
From Bahai9
How hard it is for Bahá'u'lláh to allow any of beloved of God to be saddened by Him even for one night[edit]
"Ye know full well how hard it is for this Youth to allow, though it be for one night, the heart of any one of the beloved of God to be saddened by Him."
- (Bahá'u'lláh, Gleanings, sec. 147)