Ye have been forbidden in the Book of God to . . . commit similar acts whereby hearts and souls may be saddened. A fine of nineteen mithqals of gold had formerly been prescribed by Him Who is the Lord of all mankind for anyone who was the cause of sadness to another."

Bahá’u’lláh, The Kitab-i-Aqdas, p. 72

If you are sad, and pass a child who is laughing, the child, seeing your sad face, will cease to laugh, not knowing why.

‘Abdu’l-Bahá, ‘Abdu’l-Bahá in London, p. 124

The messenger of God is often sad, but his sadness does not come from causes relating to himself. He longs that a soul become illumined, but the soul prefers darkness; he yearns to change the ignorance of the people into knowledge, their error into guidance, their insincerity into truth, their faithlessness into firmness; but people prefer their own shadows and he who manifests God becomes sad over the negligence of these sleeping ones. Are they not of the heedless?

‘Abdu’l-Bahá, Divine Philosophy, p. 73-74

When I am sad, I always pray.

‘Abdu’l-Bahá, Divine Philosophy, p. 73-74