Ecclesiastes 3:11

3:11 God has made everything fit beautifully in its appropriate time,

but he has also placed ignorance in the human heart

so that people cannot discover what God has ordained,

from the beginning to the end of their lives.

Ecclesiastes 3:22

3:22 So I perceived there is nothing better than for people to enjoy their work,

because that is their reward;

for who can show them what the future holds?

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.