'Thus' in the Bible

So I became great and surpassed all who were before me in Jerusalem; my wisdom also remained with me.

Thus I considered all my activities which my hands had done and the labor which I had exerted, and behold all was vanity and striving after wind and there was no profit under the sun.

Thus I hated all the fruit of my labor for which I had labored under the sun, for I must leave it to the man who will come after me.

I said in my heart, It is thus with the children of men, that God may prove them, and that they should see that they themselves are but beasts.

This also is a grievous evil—exactly as a man is born, thus will he die. So what is the advantage to him who toils for the wind?

So then, I have seen the wicked buried, those who used to go in and out from the holy place, and they are soon forgotten in the city where they did thus. This too is futility.