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.
Ecclesiastes 3:11-13 AMP (Bible)