Ecclesiastes 6:12

6:12 For no one knows what is best for a person during his life –

during the few days of his fleeting life –

for they pass away like a shadow.

Nor can anyone tell him what the future will hold for him on earth.

Ecclesiastes 12:13

12:13 Having heard everything, I have reached this conclusion:

Fear God and keep his commandments,

because this is the whole duty of man.