Ecclesiastes 3:9-11

91What profit is there to the worker from that in which he toils? 10I have seen the 2task which God has given the sons of men with which to occupy themselves. 11He has 3made everything 4appropriate in its time. He has also set eternity in their heart, 5yet so that man 6will not find out the work which God has done from the beginning even to the end.