'Works' in the Bible

I have seen all the works which have been done under the sun, and behold, all is vanity and striving after wind.

I enlarged my works: I built houses for myself, I planted vineyards for myself;

Go then, eat your bread in happiness and drink your wine with a cheerful heart; for God has already approved your works.

Just as you do not know the path of the wind and how bones are formed in the womb of the pregnant woman, so you do not know the activity of God who makes all things.