Psalm 90:3-17 and Ecclesiastes 1:2-11

Psalm 90:3-17
3 And, lest man be turned aside in humiliation, you have said: Be converted, O sons of men.
4 For a thousand years before your eyes are like the days of yesterday, which have passed by, and they are like a watch of the night,
5 which was held for nothing: so their years shall be.
6 In the morning, he may pass away like grass; in the morning, he may flower and pass away. In the evening, he will fall, and harden, and become dry.
7 For, at your wrath, we have withered away, and we have been disturbed by your fury.
8 You have placed our iniquities in your sight, our age in the illumination of your countenance.
9 For all our days have faded away, and at your wrath, we have fainted. Our years will be considered to be like a spider's web.
10 The days of our years in them are seventy years. But in the powerful, they are eighty years, and more of these are with hardship and sorrow. For mildness has overwhelmed us, and we shall be corrected.
11 Who knows the power of your wrath? And, before fear, can your wrath
12 be numbered? So make known your right hand, along with men learned in heart, in wisdom.
13 Return, O Lord, how long? And may you be persuaded on behalf of your servants.
14 We were filled in the morning with your mercy, and we exulted and delighted all our days.
15 We have been rejoicing, because of the days in which you humbled us, because of the years in which we saw evils.
16 Look down upon your servants and upon their works, and direct their sons.
17 And may the splendor of the Lord our God be upon us. And so, direct the works of our hands over us; direct even the work of our hands. 
Ecclesiastes 1:2-11
2 Ecclesiastes said: Vanity of vanities! Vanity of vanities, and all is vanity!
3 What more does a man have from all his labor, as he labors under the sun?
4 A generation passes away, and a generation arrives. But the earth stands forever.
5 The sun rises and sets; it returns to its place, and from there, being born again,
6 it circles through the south, and arcs toward the north. The spirit continues on, illuminating everything in its circuit, and turning again in its cycle.
7 All rivers enter into the sea, and the sea does not overflow. To the place from which the rivers go out, they return, so that they may flow again.
8 Such things are difficult; man is not able to explain them with words. The eye is not satisfied by seeing, nor is the ear fulfilled by hearing.
9 What is it that has existed? The same shall exist in the future. What is it that has been done? The same shall continue to be done.
10 There is nothing new under the sun. Neither is anyone able to say: "Behold, this is new!" For it has already been brought forth in the ages that were before us.
11 There is no remembrance of the former things. Indeed, neither shall there be any record of past things in the future, for those who will exist at the very end.