Ecclesiastes 3:1, 10-13

TO EVERYTHING there is a season, and a time for every matter or purpose under heaven

I have seen the painful labor and exertion and miserable business which God has given to the sons of men with which to exercise and busy themselves. He has made everything beautiful in its time. He also has planted eternity in men's hearts and minds [a divinely implanted sense of a purpose working through the ages which nothing under the sun but God alone can satisfy], yet so that men cannot find out what God has done from the beginning to the end. I know that there is nothing better for them than to be glad and to get and do good as long as they live; And also that every man should eat and drink and enjoy the good of all his labor–it is the gift of God.