'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.

Better is sorrow than laughter, For by the sadness of the face the heart becometh better.