'Works' in the Bible

I have seen all the works that are done under the sun; and, behold, all is vanity and vexation of spirit.

I made me great works; I builded me houses; I planted me vineyards:

Then I looked on all the works that my hands had wrought, and on the labour that I had laboured to do: and, behold, all was vanity and vexation of spirit, and there was no profit under the sun.

Wherefore I perceive that there is nothing better, than that a man should rejoice in his own works; for that is his portion: for who shall bring him to see what shall be after him?

For all this I considered in my heart even to declare all this, that the righteous, and the wise, and their works, are in the hand of God: no man knoweth either love or hatred by all that is before them.

Go thy way, eat thy bread with joy, and drink thy wine with a merry heart; for God now accepteth thy works.

As thou knowest not what is the way of the spirit, nor how the bones do grow in the womb of her that is with child: even so thou knowest not the works of God who maketh all.