'Sadness' in the Bible

for, in abundance of wisdom is abundance of sadness, and he who addeth knowledge addeth pain.'

For all his days are sorrows, and his travail sadness; even at night his heart hath not lain down; this also is vanity.

Also all his days in darkness he consumeth, and sadness, and wrath, and sickness abound.

Sorrow is better than laughter: for by the sadness of the countenance the heart is made better.