'Happy' in the Bible

I have seen that nothing is better than that man should be happy in his activities, for that is his lot. For who will bring him to see what will occur after him?

There is no end to all the people, to all who were before them, and even the ones who will come later will not be happy with him, for this too is vanity and striving after wind.

Sorrow is better than laughter,For when a face is sad a heart may be happy.

In the day of prosperity be happy,But in the day of adversity consider—God has made the one as well as the otherSo that man will not discover anything that will be after him.