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 10:10

10:10 If an iron axhead is blunt and a workman does not sharpen its edge,

he must exert a great deal of effort;

so wisdom has the advantage of giving success.